People use separate computers for wide range of reasons. My desktop isn't always running Linux for example, or even from the same partition always, and to run something 24/7 I need to host it not on my for-work desktop. I also run some less trusted software on separate server and network than say Home Assistant and Frigate.
ssl-3|4 months ago
But most of my multi-os stuff happens with VMs these days.
After I spent a few years successfully running Windows as my primary desktop OS, as a virtual machine (with its own dedicated CPU cores and accessories like GPU), the lines between separate computers and different operating systems permanently became very blurry to me.
fsflover|4 months ago
Sounds like you could be interested in Qubes OS, which runs everything in VMs by default with an amazing UI. (My daily driver.)