They can't even maintain internal consistency for the main reaction they have - Sometimes they call it by its correct name "Opportunity Attack", and sometimes they call it by the name that was used in earlier editions but is not correct in 5e - "Attack of opportunity", and it flip-flops back and forth depending on where you look. This may not seem like a big thing, but it's hard to have faith in a company doing right by a ruleset in their adaptation of it, if they cannot even maintain internal consistency with the terms of reference they use.