Proning buys you time....then why not in hospital?

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To what I have learned from research thus far, proning has proven to be effective for every age breathing issue. My question lies in why isn't it being used as a method of treatment before shifting to a ventilator also why is dexamethasone not being used instead of remidisifier. We are told to use proning for shortness of breath then how come doctors not use it for treating COVID-19 specially in most countries where cases are increasing.