All 3 assumptions you list are wrong.
The original 9x19 was developed with a truncated cone bullet, as was the .30 luger it was based on.
The only round supplied to the German army until 1917 was this design. The Germans only switched to the truncated cone due to political reasons. The allied propaganda branded it as a dum-dum bullet, voilating some treaties.
The switchover from truncated to ogival had nothing to do with technical issues.
Material shortages during WW2 caused changes in production, the only limitation for P08 pistols was the use of steel cases which could stick in the champer of a P08 due to the step in the chamber.
The 9mm variations were intended for everything that shot them otherwise.
No truncated cone 9mm was officially issued after 1917, certainly not during WW2.
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