I've had an hour long chat with Apple support, describing all the details of the issue. The Advisor contacted me with a Techhnical Advisor, and then with a Senior Tech Advisor. All of them confirmed, that the issue persist for every device on their sides, they've all looked up their internal resources (that took quite a long time) and could not find any reported issue. I've been asking them to let me know whether it is a bug, that will be fixed or is it the expected recent behavior of the MAS. The answer was: "As it seems to be this way on everyones Mac, then this is probably how it should be"...
I've tried to explain that it would be great to get the "stars back", because recently when a user searches the MAS, can't compare the results based on ratings. If a one-star app is in front of a 5-star app, they will seem the same for the user. It does not seem to be a user-friendly behavior, and it is just on e example. This is why I suspect it is a bug not a feature. They understood my opinion, and also said it was better "with stars", but there is no ongoing issues they see, so there is nothing they can tell me about it.
If anyone else gets closer to answering whether it is a bug or a permanent change, please let us know! Thanks