I prefer Larian's reaction system, it's best of both worlds. You can micromanage if you want, like in Solasta; or I can set a good-enough default and just let it play out pretty much as is.
I would like OA to have an extra toggle to ask if I want to smite or sneak attack (if able), but that's not a deal-breaker.
Reactions become more and more prevalent as levels, spells, magic items and powers accrue. Might as well have all the toggles.