Ok, I may stir a bit when I put it in, specially with long pasta varieties, but if you have enough space and hard boiling water that’s all. You don’t need to be on it like it was a witch’s cauldron. Once it’s done, it’s better to add the pasta on a pan with the hot sauce and not the other way around, and then yes, stir it gently to integrate it. You can add some of the cooking water to the pan to thin the sauce if needed. If you aren’t mixing with the sauce right away it won’t be great anyways, just edible.
I’m spanish, but I try to respect traditional cooking techniques and the way each region treats their products. Because I’m aware I don’t know better.