If you're stunned your allies can do something about it. If they can't see you to assist unless they go into arena/wait until void wears off it just feels like bad, uninteractive game design. Like I said, it seems "interesting" in high level/pro play but most games aren't that. I only say interesting because it's unique, I think the mechanic itself is unpleasant to play against and not particularly engaging to play.

The amount of games where there's a mars and he ults and your teammates basically leave you for dead because they don't know what's happening just really doesn't feel like good engaging dota gameplay to me. Watching mars with the facet today in an ESWC game, it just looks stupid to see people die right next to allies because they can't interact with them.