@Paris Geek:
I've made the same experience in my environment ( family, friends, colleagues).
However, I'm pretty sure that the members of 'inclusiveandroid.com' are mostly very experienced Android users
They may or may not be
very experienced, but it's a community with some additional challenges, where
accessibility features are important. That's something about which most of us (except those who learned it for one reason or another) have a very vague idea.
Based on those ratings, I suspect Kostya is well aware of how to make an app accessible.
(Or, otherwise, he has a great intuition.)
In either case, congratulations to Kostya for the job well done!