I personally never cared for the interchangable bit screwdriver sets. I have always used just plain old 'screwdrivers' and have a bench full of them.
If anything it shows the need for a lot of options as they say today!.
Wether you use one of the interchangeable bit sets (or two) or a cluster of mismatched old drivers like I do,,one thing is for sure is that you'll need them all and then some.
Save the cheap soft ones for opening cans, spreading solder flux and digging dandellions from the lawn. They'll do more damage than good work for you on screws.
,,and don't be shy about reshaping a good one to fit a specific screw slot when you need to.
Don't overheat if you grind them to shape. You should be able to file them too. The best should be just spring temper and a sharp file will still cut it.
I file shape most of mine when I need to.
Grinding I avoid but when I do I use a belt grinder w/a coarse belt instead of a grinding wheel, Runs cooler, cuts quick and has much less chance of burning/overheating.
Everyone has their own way of doing things,,good results and undamaged screw slots are what matter.
Demagnitize any of them by passing it into and back out of a common soldering gun loop,,with the trigger pulled of course!.