What you don't seem to get is that no one is going to admit that they bricked their unit using hacked firmware, they are simply going to return the unit as defective. One well marketed malicious firmware hack could cost us hundreds of thousands of dollars.
You're misinformed or indicating conception flaws to the lowest level possible.
Here, take this you can compile your own android and install it on the QP1 if you want: https://source.android.com/
You can also do the same with xiami kernel at https://github.com/micode
You'll find thousand of companies and products on Internet that do rely on allowing people to propose modifications.
You have complaints in this very thread and admitted you have very little manpower working on the UI / OS. I don't know who you are in Questyle but I do handle dozens of developers on a daily basis on far more complicated issues. Take the advice or simply say that questyle policy is against open source.
Just keep in mind your very kernel is based on Linux, which is open source too.
Last example for the road: Wikipedia. Up to you to be stuck in the 20th century but that didn't work out that well for encyclopedia universalis.