I too am jealous of how good Justly and Hashirama are. It's okay, we learn to accept it and live with it eventually. We'll all go through it together, like a family guys. :)
No objectives were removed and no major evidence gathering item mechanics were changed. No runs are invalid as they’re all technically able to be recreated, except maybe for the ghost orb mechanic (the turning on and off patch).
The big changes to the thermometer mechanic and the removal of certain objectives were the main reasons for resetting the board. Banning beta runs was also a needed addition that helped the decision for the board reset.
Now things should be smoother, until DK makes another very big change to the mechanics that would make a majority of the runs unable to be recreated. But for now, the smaller changes can be dealt with individually.
You need to post this suggestion in the #suggestion channel in the discord server (find the link on the left menu of this page). If your post gets enough upvotes, the mods will consider adding this as a new category.