343 has never been good at managing a Halo game. Not sure what OP is referring to specifically but 343 has made tons of awful decisions with the franchise.
Agreed 100%. Halo 4 was the beginning of the end for Halo, imo. I thought Reach was fun, but I was never a big fan of the sprinting, armor classes and weapon bloom. It still felt like Halo overall, though. I remember playing Halo 4 on launch day and immediately being disappointed. I still probably put 100+ hours into it at the time, but I remember thinking it didn’t truly feel like Halo — at least not like its predecessors.