>X would've saved the manga
At some point you just have to accept that Fujimoto has never brought any passion to the table when working on Part 2, and just wanted to make a quick buck with low effort over an IP he wasn't interested in anymore.
Surely most people have already noticed it, which explains the decline in sales, but there's still enough readers to justify making it.
Though it does feel like the manga has been rushing to its conclusion lately, we went from Aging wasting months on nothing to speedrunning through stuff like the 4th horseman, FSM and the Fire Devil, and the announcement that the Prophecy date draws near.