Hi,
I don't have a real explanation to that (maybe devs can confirm) but the streaming performance in atv are much much better than the tablet build (I'm using the tablet buld rooted and full of stuff, I didn't try a vanilla tablet build yet to compare), I'm experiencing this with xbox streaming services xcloud and streaming of my xbox one s (which are the worst optimised up to now, for info I need to stream to my Samsung note 20 ultra to get stable stream compared to my Samsung m30s) with tablet the stream drops each 30s but on the atv it's compared to my high end phone, maybe the atv build is a bare bone that's why it's much better, for devs: if you are using a different wifi driver would it possible to include it to the tablet build please.
So for those who like me want to play locally or remotely xbox streming services you should use the atv build, also another tip, when you stream from your xbox and the stream drops a lot restart the xbox and the stream will become much better (it took me ages to figure out this!).
btw the best way to test the streaming quality (and the worst game for streaming) is to play NFS heat, for me it was impossible to play it on tablet with the atv build is possible.
In any case great job lads you made my dreams come true!
Klinux