It isn't complicated. You pick a power and you spend points to use it. That is not complicated.
You dont find value in different mechanics. A lot of people do. I do. I like the feeling of flexible powers instead of the rigid slot-casting system that we have for psionics, because it makes psionics have more texture and more interesting.
And it is not complicated. You routinely saying that
- Picking a discipline (OF WHICH YOU GET FOUR OVER 20 LEVELS)
- Spending points to use its power
Is complicated is absolutely insane, and I cannot take you seriously when you say this. If you think having to, every long rest, go over your 25 or so spells at 20th level as a druid or cleric, making decisions about how many spells of a certain level you pick in regards to how many spell slots you have is less complicated then looking at your list of powers and choosing one to spend a handful of points on, then you have absolutely no business making any commentary on what is and is not complicated.