How exactly do you mandate companies produce something which they don't even have the parts to make? The problem is not manufacturing capacity or will, it's that supply chains for medical devices are global and those supply chains have been broken. Increasing production of something like ventilators purely domestically requires increasing (or building from scratch) production of the components, which requires new or re-tooling, sourcing of raw materials, etc.

Yes, the current federal mismanagement of the whole crisis is awful, but even if everyone had acted quickly, there would still be shortages. Covid spreads faster than device production.