Conscript repair is very useful in the current commander.
What isn't useful is the fuel plane flying over the axis Base. They need to change the fuel run badly, by the time it unlocks Schwere is usually up and even without that AA base defences are still bringing down the plane. If Luftwaffe supply is "vulnerable" with a Schwere HQ since OKW addition in 2v2 and up, then the lend lease fuel is suicide. You can prepare a defence with Luftwaffe supply run, you are entirely screwed after 1 supply run (if that) with lend lease, unless it's Wher only.
In some maps you can evade the base flak AA´s by calling the fuel drop to the edge of your HQ Area, and the plane should have a chance of flying through the map