> I’ve only ever heard people talk about Long Covid online, I’ve never met a single person in real life that has ever claimed to have it or has any of the supposed symptoms.

Probably for the aforementioned reasons: people aren't making the link.

Long COVID can lead to major bodily dysfunctions including heart disease, stroke, kidney impairment, neurological issues, autoimmune conditions, etc.

People are getting sick more often and not just with COVID, because recurring COVID infections have nuked their immune systems. There are studies proving how it impacts T-cell depletion, etc.

> If it’s “vastly under diagnosed” I should personally know multiple people with it

Are you not aware of your blatant contradiction here?