its not a slippery slope at all, the difference is intelect.
theres nothing stoping someone from say filling in the blanks of a setting or situation based on information he already has (world building), or perhaps considering how a entity or group of entities may act out events within the setting, or how they themselves might act, or even what the thought process of a given character has as it goes through an act. i do this all the time, and it is imo one of the best ways to continue to enjoy a creative work long after its initial experience.
somtimes the simplistic environs are the most fun, not only for the challenge and the journy of creating details that fit cohesively, it also allows one to use elements that appeal to them most ideally, (aslong as it fits, of course)
hopefuly you see my point by now, i realise what you are trying to do, but i have reasonable cause to assume most /tg/ goers are somewhat more enlightened then the average internet user, not being satisfied simply with smut (not that theres anything wrong with it, just not for its own sake.)
also, i want to point out that your argument is using the subjectivity of taste as a talking point, which ultimately dosent work in your favor, just fyi
so yeah, go ahead and make that video game thread, if you think there are compelling elements worthy of discourse and consideration.