i hear you, and disagree. i (mostly) like moneterey; i love universal control. my macs run fast, stable...not perfect, (but this is true in every OS version).
there are always bugs, issues. welcome to the world of OSes, and all software.
personally, i would not want to go back to 2009, to intel, the power pc, or... anywhere back.
advancement slows down, and this makes sense. everything cannot be an innovation; we start with 'revolutionary' ideas, then we develop those ideas more carefully, slowly.
like you, i have opinions. we both have opinions, and neither one of us (or basically, any one of us) can claim our opinions to be 'facts'. but if you think it's all garbage, buy an older mac on ebay, run an older OS, and enjoy yourself.
problem solved 👍