well done. I don't think many people wont bother but it clearly shows again how bad looking for pools actually is. especially if you're low paragon.
One additional issue with LF pools is that even though it's not XP/hour related you miss out on finding a certain amount of possible item drops / gem upgrades / mats. (time you could spend in the next rift or GR)
I usually skip them all together during a season. Wouldn't bother before 1,5k paragon at all. It's just a nice to have bonus if you're running some normal rifts anyway and gather pools on the run to do some GRs afterwards.
Completely agree. I usually skip XP pools as well. It is always a gamble if you find some and if you run quick rifts you will always have more gems upgraded and chance of better items. On high level - yes (i would say above 1300).