I appreciate that! Actually, with my house rules, your PC is the only one who can make opp attacks.yeah, any special bonuses, like "advantage on poison saves", "add d4 to dex save if failed as a reaction" or whatever are too fine grained for you to keep track of. For me, whatever makes the narrative work the best is fine by me. I've also made character choices to make it as simple to run on pbp as possible, like not using stuff that triggers much on other players turns, like oppertunity attacks
Don't worry, most of the monsters don't get opp attacks either. I've restricted them to soldier/guardian-types, dragons, tentacled monsters, and monsters with reaction/reach (e.g. hydra). Your typical bandit, goblin, or ice troll? Nope.