I would guess even if xiaomi would do the same, it would still be china devices only i suppose. Those that don't even have Google Play Store certification
MTP sucks hard and is slow and easy to overload with many files.
My 4.2 device was Umi X2 Chinese phone and I even hacked together couple Roms for such Meadiatek based devices back then. I remember my lightest ROM was like 250mb. With working PlayStore and all, but obviously only bare minimum included. Nowadays even the lightest custom Roms are 700mb+ . With Google apps and all easy 1.5GB and more.
But the thing is, only just because we can't prove it now, doesn't mean it's false. You sound like the people who would have believed that the earth is center of the universe in the middle aged. And most people thought that, even "scientist". So you would have been perfectly right to believe it. You would not sound crazy. But yet wrong. What i want to tell you, don't be ignorant and don't form opinions on stuff you don't understand. Try it in lower dose. Imagine sober real life like folders browsing back and forth. But on shrooms (or LSD, DMT etc) it's like viewing a whole folder tree. You are able to make connections to thoughts you never would have connected in real life, because they are not directly related. So called "Ahh" moments. I will never give up drugs because of that greater understanding of own knowledge. Remember, knowing is not understanding. Such drugs allow you to truly understand. And as a side note, i had the same view as you when I was young. Now i know that i just was ignorant. In the end of the day, fuck what others say. You need to think for yourself and understand the world for yourself !