Yep, the problem is that what we consider plausible is a matter of personal opinion. Some people think it plausible that the world is flat and discount all evidence to the contrary as implausible. Or that C-19 is a vast conspiracy orchestrated by lizard men.If we believe what is most plausible, we specifically exclude whatever is implausible.
It would seem so intuitively and yet we know that more training is not necessarily advantageous, sometimes quite the opposite. Training is only beneficial if the right people are trained, in the right things and in the right way. And even if those three are present there is a limit beyond which the law of diminishing returns is as true here as in everything else.However, to believe that more training is not likely to be advantageous is irrational.
Be that as it may, I have not said that the Germans marginally longer service period vs the Poles and perhaps larger gap vis a vis the French (don't know) wasn't advantageous so i don't feel the need to defend that position. What I do find implausible is that it was the critical factor to German victories in the early part of the war that you make it out to be, compared to the very real advantages of numerical superiority, better communications, massive aerial superiority and the armoured divisions -0 a crushing material superiority in every category compared to the Poles. There was no such advantage in length of service compared to the Soviets, who also had a 2-year conscript service since the beginning of conscription in 1918 backed up by exactly the same sort of pre-military training and indoctrination (after all where did the Nazi's get those ideas from?)- lengthened to 3 years in 1939, yet the Soviets did not do any better in the early part of the war.
It could be quite reasonably argued that the extended conscript service was not an independent factor, but simply the inevitable consequence of the modern battlefield becoming rapidly more complex as a result of the runaway technological advances being made in the 1920s-30s. The Germans were not the only ones to increase conscript service in the late 1930s. This was certainly the case in Poland where it had become apparent that the existing system (18+4 months) was inadequately long to encompass all the new techniques that were being brought to bear and this had very little to do with what was going on in Germany as far as i can make out.