The answer is more salt for some people and less for others.
The dirty secret is that we are all individuals with unique health. What works for one person does not work for the next.
Even nature despises a one-size-fits-all approach. It is another example of the failure of liberalism to think we should all eat the same diet and then we will all be healthy.
It does not work with centralized government and it does not work with centralized medicine.
It is why the founding of this nation was such a massive success....it tapped into individuality and embraced it, fostered it and allowed it to flourish.
Actually, it is as simple as you say.
If a “dish” tastes too salty then, yes, it will not be something you should want. If a “dish” is not salty enough, apply salt, taste and apply salt again as warranted.
That said...cook fresh at home. Take the time, as our fore-bearers did, to learn recipe techniques that please our palates.
My grandmother’s chicken&dumplings (floating biscuit style) had very little added salt...just enough to reveal the several flavors. She would hover over the pot tasting and correcting for an entire Sunday.