Couldn't you instead test outsiders, and cure 'forever infected' people probably sometime within their life? The tradeoffs aren't worth it with effective vacci

Couldn't you instead test outsiders, and cure 'forever infected' people probably sometime within their life? The tradeoffs aren't worth it with effective vaccines, but if it was something as deadly as the original SARS with a long incubation time I'm sure we'd still be doing strict measures like that.