Recently Mike Mearls did a retrospective on why D&D 4th Edition failed:
https://www.youtube.com/watch?v=lBgNSWWCpNE
There are a bunch of previously discussed discontents with that system I've discussed (or seen discussed) before. I'd been meaning to compile some of this into one place and hearing his video finally spurred me to do it. But rather than a multi-post diatribe on Mastodon, here's a blog post:
https://fantasyheartbreak.blogspot.com/2026/11/dungeons-dragons-4th-edition-gripes.html
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Why 4e Failed
YouTube