Miui 12 was supposed to be a great system, but from the MIUI 10 version, errors are repeated. System optimization in terms of battery performance is getting worse and worse, which is complained by a wide range of users.
Bugs that were often reported in previous versions are not removed (it is such a vague slogan because I have no evidence to support it).
In addition, the support time for devices has been shortened.
Is this supposed to be progress in terms of the software version or two steps back.