The only real projectile spammers in the game are Young Link, Toon Link and Megaman and Zelda....
Wolf doesn't count because his laser might as well be a whole character of its own, given how many people are carried by it.
Outside of those names, you're pretty much as wrong as wrong can get.
The games top tiers and the entire shift of meta on an actual high skill level involve little to no projectile spam, in fact, it heavily favors rushdown and spacing characters, so fast ground and air movement, and swords, not bullets and arrows.
Warrio, Fox, Lucina, Pichu, Pikachu, Inkling, etc etc etc etc. These characters (tho a few COULD projectile spam), do no projectile spam. Instead, they combo you to death. Guess what? All those names are arguable top tier viable.
I'll agree with you on one thing tho, Ultimate doesn't entirely favor strong skill over matchup, it does indeed favor matchup over skill, but if you can't beat spammed projectiles, you either are at fault for using a character you know loses to it, or you just suck and need to get gud.