A 16 year old can die in a high speed crash driving a clunker just as well as a Porsche. Just the same as someone can have a serious accident from reloading on a single stage, as they could on a progressive press.
Why would anyone drive a sports car with turbo in 1st gear--would be very detrimental to the transmission?
I would assume most reloaders, whether running a single stage, turret, or progressive, run into the same speed bumps. From expanding issues to seating depth, to crinkled cases from over crimping. I expect progressive reloaders to run into additional speed bumps: timing, powder dump, primer feeding, etc. Would assume that this would limit new reloader starting on a progressive from just cranking out obscene amounts of poor ammo an hour.
Sadly, a new reloader now is going to be limited from cranking out tons of ammo due to shortages in equipment and components. I won't tell someone not to buy a progressive, but might indicate that it might not be the press that best meets their needs.
Reloaders get very defensive about presses, and both sides of the fence single stage / progressive--both have pros and cons. I have seen posters from both sides tell "new reloaders" not to buy the other style press without taking into consideration the factors relative to the situation.
If someone shoots competitions like IDPA, and wants to start reloading is a single stage going to be practical for them if their needs are in the thousands of rounds per month?
Just the same as a casual shooter like myself, who might shoot 1,000 rounds of ammo a year--between 9mm, 45acp, 38 special. Yes I could reload quicker on a progressive, but I don't feel my volume would warrant it. I am able to keep up with my needs for handgun rounds on my turret, and rifle on my Rockchucker II.