How mature of you. Look at them, they are salty :^)
I mean, I am a huge fan of... say, Animal Crossing and I would definitely find it weird if the series had 5 playable characters. But I guess FE fans can't understand that.
I think it's more weird that people are so upset about it that they talk about it all the time. I know this piece of advice is generally frowned upon but I mean, get over it.
It's somewhat odd
at worst. One is a clone, one is a semiclone. It's a popular series with varied characters and protagonists. And the three totally original characters we have (Marth, Ike, Robin) are all very distinct.
Just, leave it be. Sorry everyone's franchise of choice didn't get more characters.
The observation
"Wow FE sure has a lot of characters. Huh."
is different from
"Golly gee I wish there weren't so many generic anime swordsmen from this series" or whatever people usually say to justify why they hate so many FE characters being in the game.
I'm not even that big a fan of FE lol. I kinda like it but the salt is mostly delicious because of the same reason say they
want characters removed.