Thanks for the answer! As a camera hop it would mean always telling the editor/post to drag the sound ~20ms back on the scratch track before syncing it up with the recorder audio, which would probably surprise a crew member if not annoy them.
As an IEM it would mean that a director would get 40ms delayed audio from the source (if Deity is used for both going in and out of the recorder), which would probably render them nervous and confused why the monitor/sound is not in sync (40ms = 1frame@25fps).
On set nobody really cares about what gear you use, things have to go fast and smooth, nobody wants to think about technical limitations like that. It's a hassle to say the least.
I really love the concepts you guys are going with, but the latency adding up seems to be a dealbreaker to some degree. I might still go for the Deity Connect, but most retailers in Europe seem to be out of stock/awaiting stock (?).