I know you didn't say that literally, but you have implied, as far as I understood, that more newer characters = less old characters. And I assumed you were going by the "if character A gets in, character B has one less chance to be in the game" logic, as if characters were competing for a spot in the roster.
Anyway, you can prefer what you want, no one says otherwise, and personally most of my most wanteds are characters from the 90s/00s, so it's not like I hate old characters or anything like that. But when someone says their opinion, others can also say what they think about said opinion, and that's what I did.
Obviously the old characters have the advantage of being, well, older, which usually means more exposure and more chances to be a part of someone's childhood. So I'm not gonna blame anyone for thinking their childhood heroes are the best, as I'm in a similar position. To be honest, this happens to all of us.
But that doesn't mean my "childhood hero" is automatically deserving, or more deserving than others potential fighters, of being in Smash. Otherwise that's a very weak reasoning if you ask me, because anyone could argue that we would be suffering of an extreme case if nostalgia googles and... They would be right.
That's why I just feel that saying a character is deserving of being in Smash is just kinda absurd. First because they're all fictional characters, Nintendo is the one choosing and the criteria for each choice is 100% different each time, and because it's not an objective thing we can define, because for you maybe Character A deserves to be in Smash, but if we ask someone else they might disagree.
I think part of this whole ""problem"" comes from fan requests with years of support behind these characters. Obviously a fan request getting in is nice and all because it's cool seeing a group of fans getting what they wanted after so many efforts, but sometimes it feels like some fans... believe that Nintendo is obligated to grant them what they ask. As if Nintendo owes them something.
And I couldn't disagree more with that, mostly because that is some entitlement that sometimes transforma, very easily, into toxicity when they don't get what they want.
Obviously in these cases, the old characters are usually the ones with years of support behind it, not the new ones, so the newer characters are seen as a problem by some fans. I guess some of them see them like "they have been around for less time than my most wanteds, they clearly don't deserve to be in, only when they achieve 10+ years of support it's when they will be deserving of getting in".
Which is obviously a dangerous mindset, at least in my opinion. Not saying it's your case, but I'm not gonna lie, it kinda reminds me of that line if thinking, which I dislike entirely.
Again, as I said, most of my favorites are not newer characters. And I myself wanted Ridley and K. Rool, Lyn, Isaac and Dixie Kong, to name a few, for years. So it's not like I despise fan requests or the idea of supporting characters for a long time.