From a design perspective, it’s almost certainly necessary to play games a lot in order to understand how to make a good game. I think it’s a good idea to have a deep understanding of the specific kind of game you’re making by playing lots of similar games, but also to have a wide general understanding of game design in other genres so you can bring in design principles from other types of games that might make your game stand out. Even as a programmer or an artist, playing games can still give you an idea of what is possible and give you inspiration for effects or other things you’d like to make in your game.
For example,let's take a small ideea: most games use a fov of about 60 degrees,a non gamer might use a different value,since he's not used to seeing games like we do(yes,its a forced example,since everyone could probably view that the image looks kinda distorted,but if you search deeper,there are many places where a non gamer dev might do mistakes).
I think that’s one of the potential pitfalls of being overly influenced by existing games. A FoV of around 60 has become standard for console shooters, but first person games on PC (where the monitor is a lot closer to your eyes) are much more natural with a FoV of around 90 degrees, so looking at it from a fresh perspective can be good in some cases.