Oh man that just unlocked a memory. My grandma used to make me taste the water too but not for pasta, it was for her bean pot. She'd yell from the kitchen "get over here and tell me if this needs more salt" and I'd have to lean over this simmering pot with a spoon. I always said it was fine even when it wasn't because I was like 9 and had no clue. Now I catch myself doing the same thing with my own soup and I still can't tell half the time. Maybe that line cook was onto something with the pasta water though, I never even thought to check it before dumping the noodles in.