Vishwam Hey!
You’re right — Google only asks for a small group of testers, but in this case, the more users the better. Since the app interacts directly with the Glyphs, and those are a bit different depending on the device model, a broader pool of testers helps surface bugs that would otherwise go unnoticed (On my first release testers had issues with Phone (1) and Phone (2a) Plus)
As for the forum updates, I just want to keep the community informed and involved in the progress. I’ve found it really helpful to gather feedback and ideas that way too!