The triangle era did do all this stuff well. None of that explains why the New 52 was an "abomination". The world-building for Superman sucked in the 2000s too, it took a huge nosedive from what the 90s did. Was that an abomination too?There is a marked difference. The triangle era built and expanded upon the character's mythology, in ways that many of us would probably agree was for the better. From the supporting cast to the main characters, there was a sense of world-building in that era that remains unmatched today.
No, they didn't. What do you think Zero Hour was for? It was because they did such a poor job rebooting cleanly in '86. And even that didn't fix much. There were tons of holes in the overall DCU lore. Its execution was enough of a mess that its actually quite comparable to the New 52. To claim otherwise is huge revisionist history.At least with the 86 Byrne reboot, DC had a well thought plan to reboot not only the character but the entire DC universe. Time, thought, and actual effort went into making Crisis on Infinite Earths and its aftermath what it was. The same cannot be said in any way about the New 52.