Well I am using this phone right now. I have bought it from MI store on November 2019. Some of the features that I dont like and have to be important are:
1) The phones back camera quality is 64Mp. But when a photo is taken and after zooming, it is not providing so much clarity that I expected. The image will become blurred when zooming the image. And it should not be blurred as it has 64 Mp tripple cameras. Same situation is with the 20Mp front camera. It doesnt look like as a photo taken from a 20Mp camera.
2) Unlike in older Redmi phones, it is not showing the time remaining to complete the battery charging. In older redmi phones such as Redmi 3s prime etc are showing how many time are left to complete full charge and it is not showing in this phone.
3) And the next thing I dont like in this phone is that it has 6 Gb internal RAM and still it hangs sometimes when I play games such as pubg or freefire etc.( Sometimes) . 6Gb internal RAM should perform smoothly in these type of games. That I want to say.