"Not allowing build absurdities" is exactly the lack of depth i mean. Whatever you do will end up mostly the same or maybe a bit underpowered, maybe you can get dome conditional +1 to some rolls if you are good.So you been dumping hard on PF2, but your conclusions are quite strange compared to my experience. PF2 may look complex, but everything is so completely silo'd that its actually rather simple. The engine doesnt allow "build absurdities" because its so tightly bound. It does a great deal to go out of its way to stop multiclass building to the point doing so is going to make underpowered PCs. PF2 is not complexity at all.
I agree with you that I dont necessarily think its the solution to D&D, but what you state is not actually how the game presents or plays, ime.
In comparison building A character in bescon is A LOT simpler, but a good built character might easily become 50% stronger than a badly built one or even more.
In the end your decisions rarely matter in PF2, but boy do you need to read a lot of rules and content to know what all your decisions are.
Especially as a spellcaster not only do you need to know dozens of spells (to choose from) no also 30+ conditions are needed to know.
Just to make a level 2 fighter with intend which only has +2 to attacks and an opportunity attack, you need to understand dozens of keywords. And you need to look up 20 levels of class fests because feats have dependencies on one another, so your level 1 or 2 choice could deny you later an option which you might want.
Or the fact that PF2 is balanced around players healing full sfter each fight, but players are required to read through 1000s of options to find some way to get their "free" out of combat healing. Beacon had the same requirement and just easily allows you to heal full after combat.
Even if there is some clear overlap, there is still a big difference between people who like to feel clever by knowing lots of stuff by heart. And people who are clever in heavily tactical combat where you must adapt to varying unpredictable situations.
These are 2 different axis, even if they of course have some correlation.

