The best armor in Final Fantasy IV is obtained in a small room with nothing interesting inside, where there's a 1/64 chance of running into a Flan Princess, which has a 1/64 chance of dropping a Pink Tail, which you then have to backtrack out of the dungeon and take it to a guy in a cave who will trade you an Adamant Armor for it.
It's one of those things where you won't ever know to do that without reading a guide, and by then, you don't really need the armor anyway, considering you're powerful enough to grind for a while in the final dungeon.
You dare quote me with more FF shenanigans? Fine.
FF8 punishes you actively for using the summons mechanic by giving you less money. Sure, you can just grind a bit more and mitigate that, but the final boss is immune to summons, so if you dragged your ass through the game on the back of summons, you can't beat the game. Try again fuck face.
FF9 spreads cancer. Not only is there a secret ultimate weapon for Steiner if you blitz through the game (arrive in 12 hrs), but the PAL versions of the game made that nearly impossible because the game speed is 1.2x slower and the clock isn't.
FF10 has several missable items in locations that don't appear to be missable, 4 letters of the Al Bhed language manuals, and an item needed to unlock the Anima summon (which comes with backstory for the villain of the game).
FF10-2 makes getting 100% impossible. You can follow a strategy guide point for point, catching every single little thing, and the game will give you 99%. Why? Because part way through the game you need to choose a faction. There aren't any cutscenes that are exclusive to one or the other, but one cutscene in particular counts for 1% if you choose A and 1% if you choose B DESPITE BEING THE SAME CUTSCENE. Also, super bosses can hit you with status ailments even if you have gear to resist/immunize against said status ailments. You're prep is worthless.
FF13 decided to base your ranking for the sidequests on how fast you beat an enemy vs how many times you attacked. If you're too strong, you can't hit the ratio properly to get 5-stars. Not that it matters, just play as Vanille and spam Death. You get 5-stars for killing with Death.
FF13-2 decided to hide all of the super bosses behind a paywall. Fuck off.
FF13-3 locks you into the endgame once you decide to go for it. Before the endgame lockout, if you feel like you aren't tough enough, you can loop to NG+ and regrind the plot. But if you enter the endgame, you can't get the bad ending anymore and have to actually get the good ending. So far not so bad... except the final boss is leagues stronger than every other boss you faced. It's not uncommon for him to just curbstomp you, and you can't grind in the endgame to get stronger. Get fucked
FF15 has a fucking dungeon filled with cancer. You go all the way to the bottom, fight a miniboss, get loot and have to climb out. Problem; the miniboss can respawn. Why is that a bad thing? Well, technically his arena is a long vertical well you pass through multiple times as you descend/ascend, and you can't climb up ladders mid combat. Guess you're ass is going back down to kill him again.