The problem with doglegs, especially tree lined one, is that they don’t necessarily cater for every player, under any conditions. There is such a wide range of distances hit off the tee these days, from the pro who can ‘crank’ it out 300y to the older guy or lady who may only hit it 200y. And yes, we can have multiple tees, but not enough to suit every occurrence.
The other thing is, I like doglegs with a little bit of openness on the inside, possibly protected with bunkers. That way the short hitter or a slightly miss hit drive still offers opportunity for the golfer to have a go at the green (par 4), even if it is an extremely difficult shot, it is in most golfers nature to go for it. Too many heavily tree lined doglegs would take some of that gambling spirit away.