I should have added that outside of Alfredo type sauces, I don't combine pasta with sauce until it's plated.
Pasta pots with strainer inserts make pasta cooking so easy.
When my pasta is perfectly al dente I remove it from the heat, lift the strainer from the pot, cock the strainer at an angle so it drains and remains above the hot water, and leave it there. Just before serving, I dunk it back into the hot water for 15 seconds or so and give it a stir. Then lift it again. Hot and ready to serve.
Everybody can the amount of sauce they want - or skip it entirely. Sometimes people prefer a little little olive oil or butter and parm instead of sauce. Leftovers are great - pasta saved separately from sauce means they can be eaten together or separately, but either way the pasta doesn't get gummy by sitting in sauce overnight and the sauce doesn't get overly thick from pasta-leached starch.
Living where water is precious, I water the roses with the cooled pasta water. They seem to thrive on it.