The reversal was not great, but also just a one time thing that still required the concensus of many entities and widespread code change and deployment distributed across countless nodes. If it was a bad call then it wouldn't have been adopted or would have forked the network in a more serious fashion than ETC. If reversals a regular occurance, then ETH would not be trusted and it would lose traction. It's like comparing an asteroid strike with a car accident. The DAO reversal is a single event and says almost nothing about the general reversibility of individual small transactions. Future reversals are very unlikely now and would have to be some huge event and gather concensus like any other change to the protocol.

A singular huge change is just not comparable to credit card chargebacks that can be executed by anyone. Not comparable at all. Chargebacks are part of the CC protocol. Eth has no such mechanism.