M80: There are very clearly things that are not Melachos but shouldn’t be done. See I believe Igros Moshe OC 4:60 (the one about timers). Also, Rav Schachter quotes a Ramban that there is an Issur Asei of “Tishbos” on Shabbos that applies if someone does things that might be Muttar but take away from the inherent day of Shabbos.
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