To me (personally) it is hard to believe that non-adjustable bridges should have good intonation (I am still at the initial string set, so I have not passed final judgement).
But on a 700-Euros SE 245 I find real hard to justify the reduction in flexibility that this decision implies.
It’s good to be skeptical (it’ll make the revelation even more impactful!). I was, too, especially since my first experience was with a ‘50s era LP Junior, which is...well, we’ll classify that wrap-around bridge as ‘special needs’.

The PRS design couldn’t be farther from those original monstrosities. If you play 9s, 10s, or 11s (48 bottom), you’ll have zero issues with intonation in standard E. Drop D and open G dialed in perfectly for me. It’s remarkable.
On a whim, I bought a USA wrap around PRS bridge to upgrade my SE245 and it works 100%. Does it justify the $$? There may have been a slight sustain and tonal
change, but it’s debatable. No change in intonation stability...still perfect. Putting Duncan Antiquities in it is the only upgrade that dramatically improved this guitar.
The bridge in my SE One is stock and intonation is dead-nuts perfect. I bought that used for WAY less than the SE245.
You can trust PRS’ R&D, regardless of the price point. It’s something that comes with experience with the brand. And something every one of us doubted, at first.