I feel like people ever rarely do Quad builds with them (which is what I tend to go for). I know Brave > Death Blow was more of a thing, though that requires someone with considerable Atk power. I'm also hardly ever seeing Cordelia, who is still very powerful even if Lyn exists.
Yeah, I know Lyn is a pretty staple archer. I actually never got one because it feels kind of boring since everyone uses her just because she's good. It's obvious she's obscenely good, fitting into every one as these roles. And as for Firesweep archers...I don't see much of a point unless they happen to have really high Atk & Spd (which just brings you back to these two).
Guard Bow is pretty much entitled to Faye, really. I really like this role, but she pretty much monopolises it. Niles and Innes are made out of paper and Rebecca's mixed bulk isn't nearly as good.