I bought my OnePlus One (second-hand, last year) specifically to run Ubuntu Touch. I tried it out, and really what drove me to putting LineageOS on it wasn't the battery life or the lack of apps (lack of apps was a plus in my opinion) but the fact that the browser couldn't display Slack in a way that I could use it. I am going to try out this new version and if Slack works, I'm keeping it.

It seems ridiculous that one webapp would cause a change in OS, but it really is an essential tool for me.