Why didn't Philippine Airlines Flight 113 dump fuel prior to forced landing?
If you had an engine fire, even though it may be "out", you want your airplane on the ground as soon as you possibly can.  You don't know what structural damage is lurking as a result of the fire.  Dumping fuel would take a fair amount time to get rid of any significant amount.

So it's "Screw the landing gear.  We're landing overweight".