Claiming someone isn't good enough to defend themselves, when they refuse to just set up a booth right out in the open, declare they're a host of this and this on a loudspeaker and have people get in line to fight them, is insulting.
In fact why would you allow hosts to have any RP at all to begin with, when the fights take priority over anything and everything no matter what? Oh you're in the middle of something that could affect the fate of the whole world? Well too bad I want to fight you now, and no I don't care if the possible sudden loss of your beast would mess everything up.
And hosts GMing RPs for challengers to find them isn't imo the answer at all, especially because to be blunt without pointing fingers, I could bet you that the instant someone did die or end up in a dead-end due to their incompetence, they would rush to the forums immediately and demand the host be stripped under pretense of unfairness.
Do people ever complain about something equally difficult to get like hiraishin or edo tensei? No, or if they did it was so long ago I don't remember it, for some reason its only the bijuu anymore, never anything else.
Everyone has freedom to try hunt any and all beasts they want, but at some point the idea of challenger privileges got twisted.