Interesting about the view on cost (of a NUC) and dedicating one to HA (ie running an image, and not Docker). Given people can (and do) spend many hundreds (or thousands) of $/£/€ on end points/devices etc, the cost of a dedicated machine pales into insignificance at that point.
Whilst I have access to RPi devices, I chose to go down the Celeron 4000 route, and that, plus the SSD and 8Gb RAM was under $200 in total. It’s easily future proofed for what I’m doing and also means I have zero performance or capacity concerns for the foreseeable future.
This isn’t in any way a criticism of people choosing other installs (Docker, VM, Supervised, Container etc), but I would have thought cost was the least of the concerns when choosing what device to run HA on.