Regarding USM Catan App & Goal to merge communities for play.
I have the USM app with all the expansions. There is no chat facility. It is not easy to find a specific game type except if you initiate the game yourself. There doesn't seem to be any way to set up an ignore list for the truely awful players you encounter and no easy ways to add people to a list of players you'd actually want to play again.
I sincerely hope the ambition of Catan Universe it to address these limitations too. Not just provide a PC version of that offering.