My homelab/PC setup is roughly 60% ARM/x86, with ARM powering my main rig. I wouldn't care to keep the x86 stuff around, except I need to keep building/testing on x86, and most of these machines are still far from EOL.
If you'd also consider appliances like Switch or Apple TV, then a combined ~99% of my gaming is also on ARM. (Waiting to see how Stormgate will fare here.)
> Outside some couple of well maintained boards (you know which one) [...]
Vote with your wallet. The Raspberry Pis are back in stock, and they're great.
Need more power? The new Macs are absolutely great. I'm eyeing Asahi Linux too. It seems it can't do USB-C video yet, which is how I've so far avoided having a KVM switch.
> [...] "the 4GB of RAM and 64GB of storage may be a letdown" [...]
Sounds very decent for something you'd throw in your backpack for a quick trip to the server room.
Of course YMMV on each and every use case, 3 years ago I was the one throwing rocks at ARM Macs, but we've come a very, very long way.