Yes, the phase/cable length issue might be a problem with larger venues. Even smaller ones like our church don’t guarantee adjacent sockets being on the same phase, nor even from the same distribution board.
I’d like to see it tried, but for venues like mine with CAT5 or better flood-wiring I’d rather trust simple passive cable (and even patchbay) links than having another device in the chain. Let us know how you get on…