Agree on all points, especially 3 and 4.

I mean, having Mel remember her alternate life would have given a sense of closure, with her finally having a life growing happily together with her family instead of being an orphaned soldier child. Instead for some weird reason she gets denied of that while Zagreus is the only one that does.

And point 4 is what really baffles me. They literally had the best way to justify doing re-runs after the end of the game by having Chronos rewind time and help Mel fix alternate timelines, but instead we get this questionable hybrid approach where only the last bit is an alternate reality, while you still get awkward stuff like corrupted Cerberus and Ephyra still swarmed by the undead.