For me, and this is just for me, it's all about cost/benefit analysis. And, to me, the costs of die rolling - forcing players to play characters they may not want to play, mechanical issues, balance issues, and frankly the fact that pretty much every die roll generation system gives higher than standard array characters most of the time - far, far outweighs any notion of "realism" or "organic character building".
See, because my first D&D was Moldvay Basic/Expert. And even there you didn't do 3d6 in order. You did 3d6 in order, but, then you can spend and buy stats at 2:1 to raise stats. Meaning that pretty much every fighter had an 18 strength, every cleric an 18 wisdom and so forth.
I like point buy because it does away with all the balance issues PLUS it makes the game about the "everyman". None of these 18 percentile strength gods with every fighter.
Like I said, you can play what you like. Fair enough. But, for me, the costs are just too much.