Uhm no. If you place a med truck you better believe that i take into consideration if the allies have access to 120 mm or even worse b4's. and i have seen some okw players losing several k's worth in mp because of squad wipes at their medtruck.
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Same could be done when you retreat to your base sector, so med truck has nothing to do with it.
And if we are talking about certain doctrines that can AoE your retreat point - CAS doctrine have recon plane, stuka dive bomb and ability to get resources to use them, so squad wipes at retreat point isn't something special that only OKW suffers from.
I have to say that I'm still convinced that only BAD OKW or USF players suffer from forward retreat, healing and reinforcement point. For example, the ones who carelessly BLOBS right into your MGs, then, unable to control units separately, he MASS RETREATS, exposing whole their army to a single AoE ability.
So, if you agree that I deflected your argument, there is no disadvantages in forward retreat/reinforce/healing in particular and free bonuses with teching in general, that smart experienced player couldn't avoid.