There are two different topics here:
1. Yes, it matters whether your approach is being hit from the fairway or rough, and what angle it’s coming in from, even at the elite level. But if they can only improve their accuracy by 5-10% off the tee by hitting something less than driver, that’s not enough of a difference to settle for a longer approach shot. It used to be worth it in Hogan’s day or even Nicklaus’s, but now the driver is way easier to hit and the average approach shot is shorter than it used to be, even on stretched out courses.
2. Yes, generally, cutting down any specific tree makes a given course “easier”. But the point of design is NOT to make the course as difficult as possible, it’s to make it more interesting. Sometimes a few trees in the right spot help; other times they just punish, and in most cases they punish B players more harshly than the elite. Elite players want more trees in play because it compounds their advantage over everyone else, but that’s not what I am trying to accomplish.