You said you were running App Tamer, and I presumed it was doing something unusual, however looking into it, it appears to be using public APIs, so it shouldn't be causing issues.
There's a lot of Macs out there. I would be surprised if that's the common experience for users, however, I fully admit that my sample size is small.
And I totally hear you on the frustration for reports these days. I set my expectations to be that it's a tally mark in some database somewhere with the hope that enough tally marks means a human looks at it, but it's so disheartening when you've spent such a large amount of money on something.
Well this is a software issue, all of the Macs out there run the same operating system, the same software. This can't an issue of a defective Mac. I also have an M2 which is giving me the same issues.
I am right now using my M5, on low power mode on a flat surface and it's almost too hot to type on. I have Codex open, just idling, Firefox and Logseq.
All of the offending processes at the top of activity manager are currently system processes: duetexpertd, mediaanalysisd, MenuBarAgent, WindowServer, Spotlight Engine, Time Machine, etc. A lot of these deal with caches, files, indexes. I suspect the root problem is a shared internal philosophy which regards the owner of the machine as a second-class citizen to the system.
It is bewildering given that I do not want the majority of "features" this tangled mess is providing. Issues such as bad caches, misbehaving files or directories, etc. are likely not the culprit since I experience this on fresh OS installs across two MacBooks. In the sense that if it is those issues, it's a system issue which needs addressing, and not PEBCAK. I have Siri disabled, Time Machine off, iCloud off, all iPhone integrations I can adjust are off, etc. Yet these processes increasingly dominate my computer.
I do appreciate you engaging with me on this and I hope I haven't come across as confrontational.