All the oil is doing is helping the pan not boil over while on a high heat as it makes the formation of bubbles at the surface more difficult. So… it kind of helps because you can cook more easily at a high heat but yeah it does nothing for the pasta.
And of course as long as your cooking pot is large enough and you are actually being present, then there shouldn’t be any risk of it boiling over and thus no need for any oil.
Oil that floats to the top of the water? Don’t see that helping much
All the oil is doing is helping the pan not boil over while on a high heat as it makes the formation of bubbles at the surface more difficult. So… it kind of helps because you can cook more easily at a high heat but yeah it does nothing for the pasta.
And of course as long as your cooking pot is large enough and you are actually being present, then there shouldn’t be any risk of it boiling over and thus no need for any oil.
It eventually gets absorbed by the pasta and makes it creamier. Unless you have too much water.