..for a moment. If there was sufficient hydraulics damage it might've stopped being controllable.

And even if they worked the fire might've damaged the plane enough.

For example https://www.faa.gov/lessons_learned/transport_airplane/accid...

when they lost tail engine, all of the hydraulics went down

To be clear, we don't yet know if the UPS flight lost hydraulics or not. There are several somewhat redundant hydraulic systems.

(Also, as a result of the Sioux City crash you linked, there were several ADs issued requiring changes to hydraulics in these airframes.)