I've probably had some paintwork done every year since the mid-70s; if I miss one year, another where I have five cars done more than makes up for it

IME things haven't changed all *that* much from the customer/owner's perspective.
Postproduction Paintwork (as Ford calls it) can be compounded/polished/etc. once it's dry. The painter might have already wetsanded/compounded/polished it before it even left the shop. The only thing to watch for is that *until it finishes curing* it might quite possibly be softer than it'll end up being (once it finishes curing). I've had repaints that were stupid-soft for over a month but then hardened up just fine. Note that it quit outgassing (at least to the extent that I could smell it) a while *before* it finished curing in the sense of attaining its max hardness.
Yeah the heating/baking can help speed things along, but not always as much as one might think/like. My painters always bake their work but I still usually wait a while before correcting it unless it's so marred up that I just can't stand it.
I've come around to using OCW (approved by Ford for this, which is why I finally tried it for this application) after decades of using fresh-paint-safe glazes, but I don't use sealants for at least 90 days. So IMO it's simple- here's a decent, user-friendly LSP that's been rigorously tested and found to be OK for repaints; that's what I now use and recommend.