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Item highlight, arrows or contextual controls make “hardcore” gamers rage but developing my game I learned they’re not always about dumbing, but accessibility.
TL;DR - I learned that "dumbing down" is sometimes about allowing players with slightly different skillsets but similar gaming tastes to enjoy your game. Other times, it can also be a last-minute solution to a design problem that you simply ran out of time to fix properly by redesign, often a monumental task in itself.
And other times, yes, it's just plain dumb