Planescape is 100% a power fantasy, only someone that doesn't understand what power fantasy means would say it isn't one, I'd say one of the reasons it's so beloved is because it's constantly stroking the player's ego but maybe in ways that they don't consciously recognize, not only do you have options to decide the fate of most characters and places but lots of things exist the way they are because of actions previous incarnations of the player character took, this is the design doc for planescape:
"Last Rites is a violent, irreverent and breathtakingly beautiful RPG set at the crossroads of the multiverse. We intend to create an
amusingly eccentric, mindspinning, cliché-breaking power fantasy splashed with visceral moments of breathtaking violence. The specifics of how we will accomplish this are detailed in the pages to follow."
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Maybe the quality and eccentricity of the writing and setting fools some people, they don't look at the game with enough critical thinking or maybe it's just the fact that since it's made in janky ass infinity engine it's hard to make it come across as power fantasy wish fullfillment in a visual sense but Planescape is very much a power fantasy RPG in the same vein as something like Pathfinder: WotR, in fact a feature of most things avellone writes for rpgs be it story or characters tend to be big amounts of player ego stroking(planescape and kotor2 are the best examples), he's said it himself in interviews, the trick is not to be too one the nose with it or they'll feel manipulated but if you stroke the players ego cock the right way you'll get them to endlessly praise your game while saying it's not escapism wankery
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