My reasons were more hardware related. When I was a bit younger my parents gave me a netbook which had 32 GB of storage, and Windows used almost all of it. I wanted to do creative projects in my free time, but I couldn’t install programs or save any of my work. I would often restart to clear log files and gain a bit more working storage, which was extremely annoying because it took like 5 mins for the computer to finally settle down and be usable.
I eventually got a 32GB flash drive which helped a lot, but it was not enough. With 4GB ram I could only have about 3 browser tabs open, and not all the programs I wanted could be run off the flash drive. It was still resource management hell.
Somehow, some way, I learned about Linux. I got a 128GB microSD, put Mint on it. It truly set me free. I could install the software I wanted, I could make the things I wanted to make, I could open more programs at once, and I could do it all without unbearable lag. I never looked back since.
Looks to be in the works which makes me very happy. If you use nightly, make sure browser.tabs.groups.enabled in about:config is enabled
https://connect.mozilla.org/t5/ideas/native-tab-grouping-more-customizable-tab-bar/idc-p/72706/highlight/true#M39420