If a OS is actively sabotaging you, then yes, the only real solution is to replace it with something else. That's the simple and obvious solution.

The simplest way to do this is to not buy a phone with shitty OS in the first place. As in "Don't buy a phone from Xiaomi".

And when users complain about it you tell them that the problem is their phone manufacturer. If you can, of course, give them a work around so the app will work. But eventually they'll plug all the holes that allow for a functional phone. So it may not always be a option.

Despite this being true many will see is as an excuse, or worse just a plain lie, and leave you a 1* (or 0* if possible) review ranting about your attitude and bad coding. How dare you criticize their choice of device?!

You don't always have that luxury.

Should you simply drop support for IE and punish people relying on it and hope it dies quickly?

Or should you maintain legacy code, and actually helping IE to survive by supporting it?

I find that issue to be quite complicated and I'm still unsure if there is a right answer to that.