On the iron, the formula was off relative to the amount of production power needed for each resource to make the wagons. The change was to put it back on the right calculation and make it balanced.
You have a chance to repair the wagons if you want under the old system. If we didn't remove the old broken wagons, then that would mean applying the new cheaper repair costs to the old set, which was not going to be approved. This was a compromise. In order to make things happen (like cheaper repair costs), then sometimes there has to be a compromise. I realize there are people that simply want it one way, but in order to make this better than the last time, compromises have to be made. The alternatives are 1) keeping it exactly as it was 2) someone else finding a solution that could pass or 3) not having conflicts.
All three are possibilities and the community is certainly entitled to figure out which one they collectively want.