the pullup or pull down resistance in the diode logic gate makes it a high output resistance device.If u try to drive another diode logic gate with it the output voltage of the first gate will be affected by the resistance in the second gate.A diode logic gate should always drive a high input resistance input.

relatively large propagation delay.

a black guy

You shouldn't use it because it is not and gate in diode logic.

mostly high speed switches in digital logic circuits