> I have been hosting all my services on a single Intel Nuc from 10 years ago and a RPI5 as backup for critical services like DNS.
Yes, fully agree with this and I've a similar setup. I even started with using wsl on the default windows install hoping to switch later to linux, but didn't have much need for this. Only gripe is tailscale seems to be flaky (rare) in windows.
Better to start with something small and cheap, see if it solves your needs and then upgrade if needs. Don't overcomplicate things based on what others do.