I don't disagree. But just to play devils advocate, I sometimes like to shoot a cast to where I think the pool boss may be very quickly. The longer I mess around on the periphery of the pool, the more likely I am to screw up and spook the good area.
It just depends on the situation. If it's wide open, the chance for screw ups is low, and you must go through the tail to get to the head, yeah, I fish the tail first.
But if I approach from the side a bit, or at an angle, and there's an overhanging branch that I'm bound to catch sooner or later, well, I try to send my first cast to the best spot. Then I fish the less likely areas. That way, when I do hook that branch and have to wade out to get it, I've already hit the best spot and don't feel so bad about spooking the rest.
And sometimes, you know you only got 1 cast, cause it's so dang thick it'll be a miracle if you can get a fly out of there. The hope is to get a fly in there, hook a fish, and wade to it. In those cases, make that 1 cast count!
Each hole is different and approach them all like a golf hole, and think about the best way to accomplish what you want. But yes, the point about spooking fish which then dart away and spook other fish is valid and should be considered.