Folly ?, probably....yet the Pz III/IVs (MBTs) got/get no press...of "Panzer" divisions (which get all the press), but were not the only divisions the Germans had.
There is the fear factor, evident in the memory of, Tigers, V-1/2, Me 262 that were a "speck" in production/usage compared to other mainstay weapons.
Why do we remember the orphans ?...new, superior, scary, unknown, temporarily unbeatable. Rumors, Gossip....fast moving killers of morale.
They succeeded in instilling terror, inferiority/hopelessness, defeatism...fear.
They bought time, for the Allies to rethink strategy, make deeper/more thorough plans.
Not enough to change anything, but it did throw a wrench in the gears from time to time.
Entertainment/excitement (for...us ?) (not to those who died by their hand), much more than war-winning.
People are "fickle" about what they choose to remember or relish, and having a major impact on the war (many times) has nothing to do with it.

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Morbius, Morbius! Something is approaching from the Southwest. It is now quite close.