Switched from a raspberry pi 3 to a second hand x86 thin client (lenovo thinkcentre m920q) because raspberry pi 4 were not available at the time. Made me learn proxmox and a bunch of other cool stuff my raspi couldn't handle.
I'm rooting for ARM / RISC-V to become more popular in desktop computing / servers though.
I did similar once the pi4s were hard to get and expensive. A used x86 mini pc was cheaper and magnitudes more powerful. It runs all my server needs. I’m a simple person: homebridge, plex server, retro game library.
Apple Silicon Macs do a great job with virtualization. Outside of them there's just no nice high end hardware that's well suited for something like proxmox. It's either low end SBC, or the hyper proprietary ARM servers that I don't think we can even buy.
Modern Android phones include a hw-accelerated hypervisor. In Android 16, there will be a feature to run a full Linux VM through what Google calls protected Kernel VM (pKVM).
Qualcomm has their own implementation called Gunyah
There are some Raspi competitors offering SBCs with RISC-V chips, there is even a RISC-V Mainboard for the framework laptops, but the last time I checked they sadly didn't reach the performance levels of comparable ARM chips.