This is spot on. Even Bitcoin has forked to roll back transactions, though not recently, and in the past only due to protocol vulnerabilities, never 3rd party

This is spot on. Even Bitcoin has forked to roll back transactions, though not recently, and in the past only due to protocol vulnerabilities, never 3rd party software like the DAO or a hacked exchange. I’d be wary of mature cryptocurrencies where this is feasible, especially if it’s "fixing" something that doesn’t affect the majority of users.