The benefit and feelings of accomplishment and joy at "figuring something out by myself" are completely nullified and reversed into rage and frustration at the knowledge of losing out on some impossible to know of item/accessory/materia/event because there was nothing there to warn me or tell me to expect it ahead of time.
If a game doesn't let you lose out and miss stuff, that's fine, no guides necessary. But that's a modern benefit of games. Games of the past totally were cool with letting you lose out on shit through no fault of your own because they'd decide their content would be buried deep within the game, with no clue to it's existence.
"It's not a big deal, who cares about the Gigas Armlet/Shinra Beta/Added-Effect/etc??"
I do. I don't like missing things and having my options snatched by arbitrary opportunity costs. That's not fun, it's frustrating. Immersion is lost when I get frustrated at my game giving zero hints that Vivi's Octagon Rod must be purchased before entering the Shimmering Island, otherwise it's unobtainable forever, and my Vivi is stuck with basic elemental spells up to "ara." That's fucking stupid. It's not a fun experience and it's why RPGs necessitate a guide, unless you're chill with eventually running into a dark room with caltrops on the floor