The one time I tried red sauce and meatballs in the IP, it scorched on the bottom. I’ve only done pasta for Mac and cheese, so not spaghetti shape, and it’s only 4-5 minutes. My kids don’t eat saucy pasta, so there’s no pint in doing it in the pot. We like it al dente, too, so better just on the stove. Then, everyone has it how they like it, in terms of sauciness or mone(dd), or just meat and veggie(me).