In answer to your query (about why would those without symptoms be admitted), the various Powers that Be are showering hospitals and doctors with magically created dollars -- a mountain of fiat cash -- for the equally magical diagnosis, approved Phama and Medical Cabal treatments, and for doing probably anything else that has the word COVID attached to it.
Economics 101 -- throw mountains of money at a product or service and the market will provide MORE of that good or service in response to the money.
In answer to your query (about why would those without symptoms be admitted), the various Powers that Be are showering hospitals and doctors with magically created dollars -- a mountain of fiat cash -- for the equally magical diagnosis, approved Phama and Medical Cabal treatments, and for doing probably anything else that has the word COVID attached to it.
Economics 101 -- throw mountains of money at a product or service and the market will provide MORE of that good or service in response to the money.