The point is, that no original devs are needed, because also the users can help each other.
Also I think a proprietary software like Telegram contradicts the values of an open Linux community.
I read in this forum, that is asked for a Matrix bridge to the official Telegram channel. If the Matrix room would bridged to the Telegram channel, we would have official devs inside.
Where is the problem if users create EndeavorOS channels in their preferred chat software? It is compliment for EndeavourOS. If they need support from official devs they can join the Telegram channel or ask in the forum.
I also think there are people out there, that will not join the Telegram channel, because Telegram is proprietary. Official developers in the channel or not.