My parents are over 90 and we tried to set them up with iPhones and iPads but as you say, the learning curve was too much. Or, the desire to climb over the learning curve was too little.
As for learning how to fix computer problems, cars are far more complicated but we aren't expected to take classes in car repair just to be able to own one.
Rant mode on....
I know several people even just in their late 60's that have given up on anything more complicated than a flip phone. I don't really understand their fears, it's not like any of them would be financially harmed if they somehow trashed a PC. And trashing a PC is not that easy to do, with a little common sense.
The only issues I've had since Win 7 that weren't due to flawed hardware (A laptop that had USB issues that I finally gave up on, and another laptop that developed video issues about a year in) don't/didn't exist. My present two machines and my Win 7 desktop(Which I built as I did most of my desktops) have been without any issues at all. My old Win7 machine was outdated and was getting to the point that it was probably going to fail soon (Folks, a PC is old at 10, some people think they should last as long as a old CRT TV, not likely, my last one was 37 years old and still worked), so I tried to buy a video card for a decent price and was unable to, so I ended up buying a prebuilt PC instead, as builders got first dibs on video cards. The whole thing cost little more than the card alone would have at the worst of the "shortage" due to the stupid mining nonsense.
If you get a decent antivirus, a malware scanner, and don't click on pfhishing emails (Call the supposed sender if you have any doubts, don't click on that link!) you will have very few problems, unless you get a dud motherboard or your HD/SSD fails. We get calls and quite a few emails asking if some "Your email account will be suspended" nonsense, signed usually by "The _____________ (Put an ISP here) team" was sent by us. We tell people over and over and over again. WE WILL NOT SEND YOU A LINK TO CLICK ON WITHOUT TELLING YOU FIRST, AND IF IT SAYS TEAM, IT'S ALMOST ALWAYS BOGUS NO MATTER WHO SENT IT. One guy, I thought he was old, but he's only 53, asks again and again if the emails with a link are legit. I paste the same exact response I sent him 10 years ago. TEN YEARS! No, it's bogus. A month a week, a day later, he asks again. "NO, IT'S BOGUS", I want to call him up and yell at him. You wouldn't believe what he does for a living.
If you are shopping, don't fall for the lowest price. There have been a lot of scam sites that sucker people in with a fantastic price. Do a search on the seller, and if the results are bad, believe them, go elsewhere. But always check the price. Some items are MUCH cheaper with another name on it, or in the case of ham radio stuff, the commercial versions of the battery chargers are like 25% of the usual cost for the "ham" version, which is identical, except for model number. You search on the battery pack number, NOT the radio, and Yaesu's in particular have commercial battery chargers for much less on Ebay than a radio store does.
Scammers have always been around, but it's easier to find them today than it ever was. Your credit card and using PP or similar can save you a ton of money if you get scammed. I got scammed for over a thousand dollars on Ebay about 5 years ago, when someone sold me what looked like a very nice old restored and recapped amplifier I had wanted for about 35 years. What came was a wrecked one that was a totally different amp than pictured. I had my money back, less shipping, in two weeks from Paypal. If PP didn't refund me, there was Visa, but I didn't need it.
If possible, ALWAYS use a credit card, or debit with a Visa/Mastercard logo on it, it got me a refund on a cell phone when the provider refused to give me one. The phone couldn't even make a phone call from my apartment, and even though I had attempted to return it from day one, they said it had taken too long to return. I got the bank involved and I sent them copies of emails I sent the night I got the phone asking for an RMA. I had my money back in about 5 days, and they never asked for the phone back, so it's sitting in a drawer.
A lot of the problems I saw with people learning PC/Mac stuff is their grandkid or whoever didn't take any time to have them do the stuff themselves, they showed them and moved on. It's not going to work that way, never has. You have to do something multiple times for it to be memorized, at least for most people. If they have them, take the computer class! That $30-50 will be money well spent. So don't go out to eat a couple of times if that's a lot of money for you. Don't get discouraged if you don't have it down in a week. If you're a worrier, get the extended warranty, if not, a year should be good unless you drop a laptop. Another thing, if you break a PC, cheap parts are on Ebay, sometimes amazingly cheap. I got a genuine Dell set of speakers that clipped to the bottom of my monitor for $7, brand new, in the Dell box. The Dell website wanted $40+ for them! My cat had somehow pulled the wall wort out of the wall, and it died on impact. I wasn't nearly as upset at spending $7 as I would have been at $40+. The CD/DVD burners in Dell laptops are super cheap too. I broke the one on my old laptop and the new one was like $5.
A lot of people don't want to change anything when they get older, but their life is always changing, and it keeps on changing. The only way not to change is to check out.