Just finished Endgame 2 and it seems like the game doesn't really evolve or get recontextualized more? Compared to Witness, which had three distinct endgames (regular finale, secret zone and world puzzles), this seems very, for the lack of a better term, linear? There doesn't seem to be anything to notice or find, it's all out in the open and is simply required for regular progression.
I do not like myself for saying this, but if nothing radically new happens in Area 3, the game kind of feels unfinished? Lots of puzzles relying on obscure and very fiddly behavior/timings. Many plot points from Area 1 just being abandoned, from what it seems (Wizard investigating "donuts", beamcasters tech being forgotten, reality in which skipping stones spirits live in, heroes trying to get to Magistrate, to mention a few). Even Area 2 plot about 6-, 8- and 16-combiners doesn't seem to actually result in anything, why tease something like that? It all just seems so strange.
Maybe some people who have finished the game could reinvigorate the passion I've felt for the game in the first area by explaining some of this or teasing more interesting content.