you need to add salt to the boiling water, but if you are trying to cut your sodium intake don't do this. also please make pasta sauce from scratch. don't buy pre mixed, just buy plain "passata" and add your own stuff. its a million times better.
I don't remember the exact numbers (and am not a doctor) but the vast majority of the average person's daily sodium intake comes from processed foods, not home cooking.
As someone who frequently makes sauce from scratch, a hunk of ground beef or Italian sausage and a jar of Rao's will absolutely get the job done on a busy weeknight when I can't be bothered with chopping up a bunch of veggies. Plain passata and your own stuff is not "a million times better".
Good quality jarred sauce is basically just the passata, onions, and garlic already prepared. Starting from those individual ingredients isn't going to somehow be a million times better than just starting with the jar.
The jarred stuff tastes marginally worse, sure. Not enough to justify the extra time of chopping an onion and garlic on a busy week night though. Pre-chopped frozen onions aren't an option for me, and I don't particularly care for pre-minced garlic.