Don't make such a OS where you have to replace ONE OF THE  very Core features of Android
The Android system WebView app
frankly
MI is best for dudes are looking to root their phones and do some crazy things in their phones in the future
Because MI UI is the main drawback of every MI phone
Whenever I want to tell the greatness of a Wi-Fi There comes a flash of Mi UI which disturbs everything
So last thing is if you want to make an OS don't completely deviate from Android
AND FIRST OF ALL YOU ARE SELLING PHONES IN INDIA SO WE DON'T HAVE TO GET THE SAME MI UI WHICH COMES IN YOUR MI PHONES IN CHINA
You can opt for stock ANDROID here AND bloatware of yours
BUT PLEASE DON'T RUIN YOUR AMAZING MI PHONES HARDWARE WITH YOUR SOFTWARE
THANKS
And i can see some material design changes while edting my homescreen in beta rom 7.6.8
So please do such things