OpenClaw is hyped for running local/private LLMs and controlling your data, but these people don't realize the difference between
(1) running local open source LLMs
(2) and API calls to cloud LLMs.
The vast majority will do #2. To your point, a Raspberry Pi is sufficient.
For the former, you still need a lot of RAM (+32GB for larger models) so most minis are underpowered despite having unified memory and higher efficiency.
If you want your "skills" to include sending iMessage (quite important in the USA), then you need a Mac of some kind.
If you don't care about iMessage and you're just doing API calls for the inference, then it's good old Mass Abundance. Nice excuse to get that cool little Mini you've been wanting.
Because it's the easiest way to give "claw" iMessage access and that's the primary communication channel for a lot of the claw users I've seen.
I have a 10900K with 65GB RAN and a 3090 24GB VRAM lying around gathering dust. 24GB isn't as much as a Mac but my cores run a whole lot faster. I may be able to run a 34B 4bit quantized model in that. Granted, the mofo will eat a lot of power.