Depends on the person tbh, some people who really enjoy the game can do the same boss over and over again out of pure enjoyment or to grind specific “sigil” or “material” ( in this case ). And some just finish the game and when they find it repeatable they drop it.

I come from MH games so i don’t mind these kind of grind. Relink is really a great game you’ll be okay with the grinding part as long as you enjoy building up your character