>>21495263 (OP)Every single person ITT is wrong.
The reason that one adds a good amount of oil is to coat the pasta as it cooks.
Oil is hydrophobic and so will 'attach' ie coat the pasta with a thin layer, which changes the way the pasta absorbs the salted water - it has to go through the oil - and the pasta ends up with a different texture to pasta cooked without oil.
Also, the oil is absorbed by the pasta while it is cooking, again giving a different texture.
You don't just put oil on the surface, you use a large fork or a pasta ladle to pull the pasta up through the oil several times until all the pasta has been coated, then you let it cook.
1000% makes a huge difference, and if you think otherwise you are wrong.