The Super Jolly is fine, I have a used one at home that I’ve had for 15 years (which I use now with a Linea Mini that I just a couple of months ago) and get really good results.

The point is that investing in such a crazy expensive machine but not a much better grinder is really foolish, because the machine is going to be limited by the grinder so they may as well buy a machine that is 1/3 the price.

But really it sounds like 80% of the problem in the case tow OP is talking about still would have been the poor skills of the baristas, because they should still be able to pull very decent shots even with the mid-range grinder.