Not having to pay $80-$100 (per machine) for the OS is a plus. Not having to deal with ridiculous shenanigans like 8's "you can only sell apps for the modern interface through our store which takes a 30% cut, and only if we want to sell it" (or whatever it was) is a BIG plus. And in general not being beholden to a single company with a spotty customer-service track-record (that would apply to both Microsoft and Apple).
That said I still use Windows for everything, I'm not an idealist about it, but I look forward to the day when I have viable alternatives.
On the textbox thing: yes, the unity upgrade broke it for all platforms. Even if we didn't do a linux build it would still have broken it. Though the linux build is the main reason we did the unity upgrade.
One of the things I hope to pull off with the UI is to get away from the underlying stuff that leads to that kind of nonsense
Which our other games on later versions of our architecture have mostly managed to do, it just takes a lot of time to retrofit something like that, etc.