Balancing decisions are not "mistakes", as much as we wish they were considered mistakes.
Crown Store prices being too high or low than intended or character data being copied from the PTS to Live are "mistakes", and those were swiftly repaired as ZOS owned up to those mistakes with compensation.
Some more clarification from ZOS on what exactly constitutes a "mistake" would be appreciated for future clarity. Otherwise we could say any unfavorable change was a mistake and we'd be complaining to ZOS for months to remedy something that they don't consider to be a mistake.
Any decision, even if well meaning, can be seen as a mistake given time if the decision has negative consequences. That's the thing, we see performance worsen and populations decline as a result of many of the decisions made. In retrospect those decisions can now be seen as mistakes. I just wish those mistakes were acknowledged and made right, that's all I'm asking for.
Can you give a list of mistakes here for ZOS to review?
I would not be able to fit that here on the forums.
I will say though, I've written detailed posts outlining what I think were poor decisions when they happened. I've been vocal about the "play as you want" model, subclassing, balance, accessibility, the state of PvP, the list goes on and on. You can probably search for my posts within the past 3 or 4 years if you care.
Of course I'm just one person, but I've seen mass sentiment around certain decisions that have been made and the concerns were never acknowledged. Anyway, I only point this out as someone who wants the game to improve since no other game like it is on the near horizon.