True, but thankfully there are a lot of choices in that space, and it’s constantly growing. And if there aren’t, a lot of times it’s possible to make one (or buy someone’s) using an esp32 or similar. Zigbee, zwave, and matter devices should all be possible to run local only.
Win 7 64-bit handily beats any distro of Linux at .69% (nice). Comparing only to 32-bit isn’t a fair comparison. Not that I’m against using Linux, I use Pop_os on a spare computer as a Linux test bed for gaming.