Sure, but even if they started tomorrow it would probably be years before it even could be considered experimental outside of the most daring early adaptors.
Having a combability layer is not ideal but it would mean they could have something worker for more users faster and at the same time see which modules/drivers they should focus on.
There is also the risk of homograph attacks. The link below is for domain name encoding via IDN, but the same applies to usernames. You could easily impersonate another user by having chars that look similar.
https://en.wikipedia.org/wiki/IDN_homograph_attack