I absolutely love PRS, and I'll be the first to recommend them, but they're a little on the pricier side and I don't recommend newcomers to buy used, just on the off chance that there may potentially be something wrong with the instrument. Don't get me wrong, I trust PRS's quality control, but that's a little beyond the realms of predictability. Besides, new instruments have return warranties.

That said, some of your arguments are either incorrect or strawmen. If you don't mind, I'd like to go over a few of them shortly.

I can't imagine why anyone would recommend a Yamaha

They're well constructed, sound decent and can be had for relatively cheap.

inferior bridges, nuts and headstock design

The nut is a valid point. Most squiers people bring in to the shop have the nuts cut a little rough, but they're functional and are cut to the right specifications. They're pretty ugly to look at, though.

The bridge argument is a bit of a no-go. The PRS wrap-around intonated bridges are cool, I will cede that, but they aren't optimal should you want to switch string gauges. The other bridges PRS uses are either standard strat bridges, or tune-o-matics, neither of which have any explicit advantages.

The headstock design is relatively standard, actually. In fact, I'd compare it quite closely to an Epiphone, looks aside. They are laid out and angled similarly, and the headstock joints are scarfed in the same way in order to prevent breaks. You typically can't see this on Epis, however, as the necks/headstocks are often glossed.

For Gibsons and Fenders, however, I agree on the headstock point. Fenders use string trees, which are annoying and cause issues with the strings dragging and catching, and Gibson headstocks are fragile due to the lack of a scarf or volute.

great pickups, tuners, intonation, tone

I'll cede that the pickups are consistent, but whether or not the tone is good is totally subjective to each individual player. I personally like them.

The tuners are standard for most guitars. Nothing to see here.

Intonation is adjustable.

Install your pickup of choice later on for an average of about $90 (Seymour Duncan JB for about $79 for example) and Grover 406c locking tuners for about $49 and you practically have in your hands a guitar that offers the tone, feel and quality of a several thousand dollar guitar.

The same can be said for the rest of the guitars I have mentioned.

I've been playing for 18 years

I've been building them for 30.