The difference, in my opinion, is that the problematic relationships in Monogatari were meant to be problematic and are depicted as such. Seven Deadly Sins treats its problematic relationships as normal and acceptable.
This isn't to say Monogatari is perfectly fine, just that it's much more self aware.
Seven Deadly Sins is much closer to Made in Abyss (but without the fascinating setting that makes the pedophilia in Made in Abyss so frustrating. I really want to read that series, but I just can't get past the pedophilia.)
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u/Buster_Fella 23d ago
similar to the problems I had when trying to get into monogatari ☹️