I was learning OpenGL at the time and I was frustrated that I could not play a game using OpenGL (When I use a technologie in programming, I love using software that use it) because none of the games in my library supported it. So I discovered Ubuntu 16.04 and I immediatly loved it. I also reinstalled it seven times because every time I broke it and I didn't know how to fix it.
What realy chocked me at the time is how easy it is to install C++ dependencies for your project. You just use the package manager and boom, you link it to your project and your done and if for whatever reason the package is not available in your package manager, you can build it manually very easely.
However, there where some downside too. VSCode didn't exists at the time (or I didn't ear of it) and the only proper IDE was kdevelop which I never liked. Hopefolly, when VSCode came it was realy cool, but not as cool as when I discovered NeoVim. The gaming too was bad, Proton didn't exist, Wine was not as advanced as today and DXVK was not a thing yet. You could only play games that where 5+ years old and only at 15/20 fps with a lot of glitches.
Linux nowoday serve all my needs, I only need to start Windows when I deploy and test some program to it or when I play a game that is not well supported on Linux and I only do it in a VM with single GPU Passthrough.
Yes, the phone need to be on. If the phone you are sending an sms to is not on, the application fallback to standard SMS.