I have only booted into my Windows install like 2-3 times in the past 5-10 years or so. But I still have it, it just lives on a separate SSD and I just forget it exists. I’ve only booted in to set up Minecraft Bedrock (kids wanted cross play, but their friends flaked), one time to run updates (was going to upgrade to Win 11, but it hated my processor; maybe my new one works), and to test a couple things in Windows. That’s it.
When Microsoft EOLs Win 10, I might go through the trouble of upgrading it again. I don’t see much value in it, but it costs me nothing to keep it around. I’m not even sure if it still works after I upgraded the CPU and GPU, but I guess I’ll find out the next time I try to boot it.