@Hugh0 I don't particularly agree. I have never used IB, so I have never been privy to see the star ratings.
Hosts who use IB can see star ratings and specify that the guest has to have verified ID and be recommended by other hosts because IB hosts don't have the opportunity to communicate with guests before a booking is confirmed.
Hosts who don't use IB vet guests based on looking at their past written reviews and the way the guest communicates in messaging with the host, which in my opinion and experience, is a much more reliable way to vet guests than looking at star ratings.
As I'm sure you are well aware, star ratings hosts get are entirely subjective- guests will rate 3 or 4*s even if there weren't any issues.
It's exactly the same with star ratings for guests- they really don't tell you much. Plenty of hosts have had horrid guests who had 5* ratings.
It seems to me that hosts who have been used to using IB, and then decide not to, have come to rely so heavily on star ratings as opposed to reading written reviews and communicating with guests, that they put much more value on them than is warranted. You really don't need to see star ratings to protect yourself from getting bad guests, trust me.
As far as I'm concerned, star ratings should scrapped entirely, both for hosts and guests. They are a constant source of stress and contention and are just a behavior modification tactic. Written reviews are all that is needed.