The main problem with Smash speculation (aside from general roster***ing) this go around was leaks. Gematsu/Sal Romano specifically.
People clung to that **** like it was the bible and wanting or believing in any characters outside of those leaks got a pack of mad dogs after you.
And even after a character not on the leak at all was confirmed early on (

), people still clung to Gematsu. And even still after all of the other discrepancies between it and the actual roster, like "lol say hello to my friend Shulk *enter Robin and Lucina, Chrom deconfirmed*", people STILL clung to this specific leak. I don't care if it got

in the first stage. Maybe that was legitimate info, maybe it was a lucky guess, but either way, Gematsu got a bunch of stuff wrong, and most of the characters it predicted were safe bets that a lot of people were thinking of anyway. But for some reason, everyone stuck to this leak like it was gospel, and you couldn't ask for anything outside of it. It's the one specific leak I can recall people ALWAYS going around to.
That stuff got old real fast. I don't want to see any other leak dictate a fandom like this ever again. It's one thing if the leaks show gameplay, since you can't deny it's real and there's no room for discrepancies, and actually seeing things in action is potentially exciting. But some stupid list of names is not exciting, people just keep throwing it in your face like a pushy religious guy constantly quoting the bible, and I don't want to see it again.
Heck, I mostly just don't like leaks in general. Nintendo needs to up their security with info on their games.