In my opinion, it's much more fun to debate that something has legitimacy than it is to try to shoot it down, and even more fun to go galaxy brain and do both, and that's for the simple reason that it's more mental exercise to point out what makes something valid than it is to point out the fairly obvious things that make it invalid. If it's gonna legitimately hurt your feelings to not have tempered expectations, I get that - I think I was probably way angrier about Piranha Plant thanks to hoping for Isaac and Geno than I would have been without that hope, but to be fair, you and I can see eye to eye on a point that Piranha Plant being a fighter does feel like they're saying it has more importance as a character than someone like Isaac or even Waluigi, and that made me angry, too. Even then, I look past it and remind myself that Piranha Plant did not steal Isaac's moveset and therefore isn't technically more important, just different.
I mean, I play Smash competitively not for the joy of winning, but for the thrill of the challenge and the excitement of having my wits and reflexes tested against someone else. Trusting a leak is the same - a competition of wits against others, myself (and yes, I mean I am actively psyching myself out), and the leaker. There's no real victory state, it's just fun.