I for one am going to be sad the day I have to upgrade phones. I absolutely love my U12+. HTC does not really seem reliable anymore, does it? It's July 2019, Android Pie has been out close to a year now, and the patch is just now rolling out to the U12+ (still waiting). I'm also frustrated by AT&T not supporting it like it does its other phones. I amazingly have VoLTE, but no wi-fi calling or HD calling (HD calling provides a lot of other cool features like visual voice mail, robo-call filtering, etc). I don't think I'd buy another HTC phone because of the lack of support for their phones.
I took a 2-year vacation from HTC with the Galaxy S7, when my wife wanted one, and AT&T was offering a BOGO. I actually tried very hard to bring my M8 over from Verizon, but it wasn't compatible. Yeah, Samsung makes incredible phones, but they ruin them with terrible bloatware, a single cheap sounding speaker, and Apple-like control over everything. And their buttons are backwards from everyone else. I was so happy to have an HTC again, but now HTC suddenly sucks as a company.
I don't know what I'm going to do when I replace my U12+, can't go back to Samsung, and HTC probably won't make anything in 2020. I am hoping this patch gives my phone a little more functionality.