IronWolf
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My guess is that we'll see OAs as a 'dial setting' within the core rules, & that this playtest is just using the simplest setting.
I hope this to be the case. I do suspect it is easier to release without that rule and just see what happens. We all know what happens with AoO's in the game. Let's test it without and see what folks say.
I've played without before and am not a fan of not having AoO's, but this is a good way to get the concept widespread exposure.