This statement is false. You’re using a version of Android which is seven years old, development of Discourse only began in 2013. You’re also using a very nonstandard browser. Let’s look at global mobile browsers for Jan 2020:
- Chrome: 64.1%
- Safari: 17.21%
- Firefox: 4.7%
- Samsung Internet: 3.33%
- UC Browser: 2.61%
- Opera: 2.26%
- Edge Legacy: 2.17%
- IE: 1.68%
- Android: 0.54%
- Other: 1.41%
Lightning and Mi Browser falls somewhere in that bottom 1.41%. On that basis I would expect zero compatibility effort - if something works then great. When it stops working, and it is a matter of when and not if, then it’s time to get a better browser.
I don’t think this is fair, based on the list of supported browsers nothing is broken. You’ve no more right to ask for a fix here than anyone can insist you use a different browser. If you don’t want to use a better browser, then nothing’s going to change.
Extended support for Android 4.4 ended in October of 2017. That date has also long passed.