@Shannon23 This isn't something new. I have never used IB and have never been privy to star ratings.
But I'll tell you something- I couldn't care less. Star ratings are totally subjective- I have no idea whatsoever why another host would give the star rating they did. I follow another host forum and a host posted about some guests they'd had, asking for input on what ratings other hosts would give to those guests. The answers ran the gamut from 2*s to 5*s. These were all experienced hosts.
When you don't use IB, you read the written reviews, which tell you far more than the star ratings do. Personally I dismiss reviews that just say"Nice guests" or something to that effect, because when I look at the other reviews that host leaves for guests, they are all the same "Nice guests". That tells me nothing. I rely on the reviews that actually tell me something, and to a great extent on the way a guest communicates with me through messaging.
If you are used to using IB and relying on star ratings, it will be a bit of a shift for you, but I think you'll find that you'll end up feeling way more in control of a booking and possibly even getting better guests once you get the hang of answering requests, and reading reviews before accepting, rather than putting much stock in star ratings. Requiring Requests is less of a risk than star ratings and IB.