I feel these arguments are very weak, undeveloped and ignorant. And I'm not being biased; most of the ignorance is towards KH.
Disarming? Keyblade is part of Sora.
Little kid with a key? Sora's 16 (he's probably older than the person making the claim, probably not 😆) and Sora's only looks like a key, while having many abilities. Most keyblades do not look like keys, for that matter.
Link is strong without his sword, Sora needs the keyblade to do his strength feats. Well this isn't a wresting match, rest is self-explanatory.
And just why, are there extreme opinions? This is close. Unless we get into every single item and plot device each character can use (Link with Triforce and Naryu's love, Sora with wish-granting Genie and Tinkerbell summons), with melee's, projectiles, magic in skill...there's no curbstomp.
I also feel one or two people bothered to watch my videos.