Lots of reloaders have started with a progressive, and have had no problems.
I'm not sure I agree with the "learning to drive a Formula 1" analogy. It sounds good, equating speed with potential danger, but I just don't think it is accurately applied.
Once a progressive press is properly set up, I don't believe there is any particular danger in operating it at its design speed. I will agree that it is quite easy to make a few boxes of bad ammunition if you jump into full speed before setting it up correctly. Also, it could be argued that checking the results of each station
is part of proper setup, and that if you do this you
can't make bad ammo.
At least, that's what my experiences were with a progressive.
IMO, a lot depends on the quality of the instructions you get with the press. Some manufacturers do a pretty good job of this and others, well, don't.
If you follow those instructions, and that means setting up a station correctly before trying to set up the next one, you won't have trouble.
All a progressive press is is a bunch of single stage presses arranged on a common frame. Yes, some stations involve something with a little more complexity, like the powder drop at Station 2 or the primer feed at Station 1 (using Dillon 550 as an example), but each can be set up individually.
I think the problems may arise with these two stations, actually. If you are comparing a single stage technique with off-press powder dispensing into each case in batch mode, the progressive's powder-thru die has a little more going on as it combines belling with powder drop.
And, if you are comparing single stage technique with off-press priming in batch mode, the progressive auto priming mechanism has more to adjust.
So, I don't believe it is either "speed" or "multiple things going on" that is the cause of progressive press problems. It is more likely the user being forced to figure out a bunch of adjustments, and rushing to the next step in the instructions without following the first step correctly.
As following the instructions correctly isn't optional, I can't understand why they are mystified at the lack of success...