Saying that half the population somehow doesn't matter for one of the country's largest supermarket chains is completely mental on every level and is not a serious viewpoint.
I give my engineers different Android phones as their primary development devices and yet the weird Android issues that keep cropping up are near constant.
When it's a "works for me" on one platform but falls over with different hardware, that usually points to some serious issues (e.g. threading, contention, false assumptions) in your code/app.
Not to say that there probably aren't buggy areas in Android itself, however with an appropriate test budget you could determine which are likely hardware (different phones) vs OS (common across devices, with simple repro apps) vs your software (you have bugzorz).