You're talking about this US military policy like it wasn't just another panicked reaction at the height of the crisis.

The vast vast vast majority of young people with coronavirus don't have any of those long-term side-effects. Most of them don't get more than the sniffles, if any symptoms at all.

If you've looked at the anecdotes about how readily the virus spreads, you'll realize that avoiding people until a vaccine is ready is ridiculous. The public health plan, all along, has been for most people to get the virus, but at a slower rate ("flatten the curve"). Being this deathly scared of the virus for that long just isn't a feasible plan.