I have been a loyal MS Mobile for years starting with Mobile 6.x on a Motorola Q9c and currently Mobile 10 on a Lumia 735. I would love to see the Lumia line move forward, but neither MS nor the app development community seems willing to put skin in the game and here, in the USA, I don't find carriers interested in phones with the OS.
I have recently been seeking support for email issues that have appeared out of the blue and have found the very same problem among other Lumia owners with different models. The pattern indicates a systemic problem within the OS, but MS has essentially turned a blind eye to support questions of many sorts from what I can see which is somewhat understandable given their recent end-of-support announcements for the mobile OS.
Support for a Lumia future is inseparable from support for the OS. If we have the latter, we won't have the former.