Ratings are not just about an app functioning, it’s about if it’s any good or not. And by showing only reviews of a certain type, users might not see a lot of the complaints if they are from people on different hardware.
Seems like a way to limit effects of discontent in my opinion.
Let’s say you have a Samsung s20 or whatever. Millions of people will have that. So if you are not complaining from that type of device AND from the same region, your reviews may not be seen at all.
This is how you make sure that bad reviews don’t impact applications like reddit so much.