Well, I definitely think fixing something is the right thing to do, even if late.
In the case of Bethomia being "too easy" now, well that's horrible for those who were doing KBNh, and ToSH hard before that. But it's great for the more casual crew who hadn't quite stretched that far. Could be designers just decided to build for a different segment of the population this time instead of a simple mistake. (Not saying that's necessarily good overall, but could be a reasoned decision.)
As for Targonharl and Hippo fixes taking away an advantage some folks were able to use, well that's exploiters. Correct response would have been to ban/strip rewards from those who used it (definitely Targonharl - Hippo at least it took a group and couldn't repeat immediately, so maybe more lenient there). But that would require RoM to have active human staff. Not happening. Just have to accept that RoM is a poor game in that regard. Enjoy it for its good points, or leave if you can't handle the bad points. Those are the choices really.