I have to wonder just how many groups out there are playing with spells and/or ranged attacks triggering Opportunity Attacks in 5E. I suspect it's a disturbingly high number, and that in virtually all cases, it's not an intentional house rule, just an assumption. In the three games I play in, I've had to gently explain to two of the DMs that in no cases in 5E short of the Mage Slayer Feat (or similar) does spellcasting or shooting a bow or whatever trigger an opportunity attack, and also have had to explain that to several players who demanded OAs when enemies did those two things near them. I guess the combined weight/inertia of 3E and 4E is quite a lot to overcome.
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