A Raspberry Pi multiboot lets you pick Raspberry Pi OS, Ubuntu, or MX Linux at startup without changing SD cards.
Raspberry Pi and other SBCs can boot an operating system from SD cards and USB devices. I own multiple SD cards and am a fan of swapping them to instantly switch to a different OS, such as RetroPie, ...
It is very normal to have multiple operating systems installed on a PC. If you need to use Linux and Windows for your work purposes or any other purposes, the obvious option you have is dual-booting ...
Testing different operating systems is something I do a lot of (mostly for work), and while I enjoy it, it can definitely be a hassle to constantly have to switch operating systems. It's already a lot ...