That's part of why I picked the front ends; they're already trusted third parties, or second parties, or something. Trusted middlemen. You're giving them either your keys or your auths already, except maybe for the few people using @yabapmatt's new thing. I'm not totally clear on how auths through that work. So there's not a whole lot of extra trust added there.
Also it's hard for anyone else to set beneficiaries.