You don't really see this issue with board games, and neither in video games aside from the most dedicated Skyrim modders.
Maybe you don’t. It just goes the other way in board games. It’s much easier to get people to play an evening of short games with simple systems because they can “play and forget” each game, without really investing anything in it. Getting players for the big 4 hour Cthulhu games is
much harder, because people don’t want to invest that much time or mental bandwidth into a board game.
Video games are the similar. Most are played through a couple times and then you
replace them with soemthing else. MMOs differ, but that is likely because MMOs are a time sink, and you need to invest time and mental bandwidth to get the most out of them, and most people don’t want to do that for multiple games.
Like with MMORPG players, the vast majority of moderate to long term TTRPG players I’ve ever met have played between 2-6 TTRPGs, found the one they like best, and eventually stop trying new systems because they’ve already invested in and learned the one they like.
In all cases, people don’t want to bounce around between many high-investment, time-intensive, long-form gameplay oriented, games, but doing so with very small, rules light, fire-and-forget, games is no big deal. Folks who don’t find that sort of “low-investment” gameplay satisfying for TTRPGs will probably find a more robust system that they enjoy, and stick with it.