It's a case-by-case thing but very generally speaking, I agree with o.p.
When I was getting started growing & doing my "research", I'd see so many people with 4 and 5 ft tall indoor plants, and the bottom 3-4 ft was bare branches? --WHY THO?? It seems like "more plant to feed" but "less plant to harvest"?. . ...But then I'd see those donkey-dick colas and be like "OH, okay"
On average, me personally, I veg for 28-35 days then flip, only because I want quick turnarounds. That's it. I want everything to be done as soon as it can, BUT, i still want to maximize each plants' potential as best but also as easily as I can.
My opinion on ppl who veg longer: THEIR top priority, quality aside, is (probably) yield. Mine, personally is speed.