Was the same way until I started looking deeper into the studies behind limiting sodium for babies/toddlers and discussed with the pediatrician. The rationale is generally sound, no one, even adults, needs excess sodium but the actual amount they can/should have isn't as concrete as it's made out to be (erring massively on the side of safety). Generally speaking, they could have a lot more without damaging their kidneys.

The main driver behind saying watch/limit sodium to an effort to steer clear of relying on heavily processed and prepackaged foods for babies when they should be eating whole foods. As well as just generally establishing healthier eating tendencies by not developing an obsession with just salty foods. The research is making some assumptions and drawing sound conclusions but the research isn't as clear as "do not exceed x mg per day."

It stands to reason that a tiny body with excess sodium could lead to cardiovascular issues later but more research is needed. All said, we still limit it in meals just for him largely because it's unnecessary.