I still feel a bit sad about the changes that happened ~2012. Linux on the desktop really had a strong momentum going around Ubuntu and Gnome 2, where quite a few non-geeks started switching over as well. But then everything fragmented quite rapidly – Gnome Shell was quite unpopular on launch, Ubuntu went in their own direction with Unity, Mint went in a different direction with MATE and Cinnamon, Elementary forked off Pantheon, etc. Similarly, RedHat pushed for Wayland and Flatpack while Canonical pushed for Mir and Snap, and so on.

I'm not saying that Ubuntu/Gnome was everything Linux had to offer (I myself was on Arch and i3wm at the time), but that period was certainly when the largest percentage of people around me were enthusiastically adopting the Linux desktop.

For me, Ubuntu / Gnome 2 came so close to being something tech-savvy people could recommend to non-technical friends and relatives at a time when people who were happy enough with WinXP and Win7 were being corralled into dealing with the Win8 carcrash. And instead of closing that final gap it went scampering off into the far distance again, never to recover.

That's normal in Linux. It's always about to get really good then everything is made crappy again, then slowly improving to get good but then the cycle repeats. I've lived through several of such cycles, it has slowed down Linux adoption a lot.