It’s hilarious to me that a bunch of people are saying Post Crisis was this. Just proves that whenever you started reading comics is the peak of comics lmao.
I mean Superman sure as hell was not consistent or free from retcons/reboots. Johns did a massive retcon to Emerald Twilight with a “nothing will ever be the same again!” minievent with GL Rebirth to kick off his run. The Titans were full of changes, Kon became Conner and got a whole new backstory, Tim lost his dad and became yet another moody dark orphan under Bruce’s care, there were tons of events that made things darker and edgier like Identity Crisis, you had Bart getting aged up and being the Flash before being unceremoniously killed off. Morrison did some major changes to the Batman franchise that went against the established “gritty and realistic” vibe from the Rucka & Brubaker era.
Remember when Bludhaven got nuked via Chemo?
The truth is that there has never been a time when DC was free from events or massive retcons, and the same is true for Marvel (remember when Stan called Bruce Banner “Bob” and then retconned his name as Robert Bruce Banner to cover his ass?).