TaranTheWanderer
Legend
This sounds like an excellent idea.
I need to consider further what types of PCs it would help or hurt. It'd definitely be bad for monks and two-weapon fighting, for example.
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My group just recently started using this but haven’t had a chance to put it to practice so I’ll let you know how it goes. We did have lots of discussion around it, though.
I’m not sure it would hurt any specific class but, instead give more options: do I want to use my off-hand attack or do I want to attack once with advantage? Same with a Paladin: do I want to flank or do I cast sanctuary. For a character who doesn’t have a bonus action, it’s a boon.
It might hurt the mastermind rogue because they get the ability to do the help action as a bonus. But they never need to be in a flanking position to do that so their ability is superior to flanking.