Sorry but what is issue with xda?
Remember, xda channel is more user friendly. Here everyone have to keep transparency, stick to rules including developer too. You may have seen many users just kicked out of telegram group for some minor reasons. Here users get liberty as well developer has to strictly follow rules of xda. Apart from this now a days it is not uncommon that some channel are allowing Warez in telegram which is completely against the spirit of xda, for what it is known for. So it is also difficult to monitor and keep group clean, instead moderation team is doing there better job behalf of us.
If someone have complaints regarding any contents of thread or with dev, you can always appeal to moderation team. In private channel no one will listen you. I have nothing to share privately that xda not allow me. So I am always in favor of XDA.
Also I wish users should always ask for xda support rather then private channel.
I like to take opportunity to appreciate & My special thanks to whole moderation team