I believed I talked about my acceptance in diversity of human height and weight earlier in the thread.
For the most part the problems of scale in related areas of scale modeling like wargame toy gaming isn't about the real variation in human body size with regards to socio-demographics in human history of war.
It is about manufacturers, that want to sell their toys under special industry related restrictions.

In fact, body size and health are probably an important factor in war survival rates that toy pushers like us rarely consider.
Because, well, we push toys across a table, not Excel spreadsheets on the socio-demographics of war.
At best, war game rules today contain some odd troop ratings.
Mostly three-tiered, because it's easier to remember.

But you make a fair point about just forgetting about accuracy as I will likely do some sort of Weird War 2 anyway and most of my gaming will be solo… so not much chance of my opponent complaining.
That's the spirit!
There is no bad buy, just an opportunity for a new project! 
That's also why my toys these days are mostly denizens of a strange nurgly swamp of hell garden and slaaneshy red light district, an unholy communion of the Chapman brothers and Alice in Wonderland with a hefty dash of Hieronymus Bosch and Toy Story.
Not to forget about Lovecraft, Michael Hutter, early pulp novels and hundreds of influences more I like to corrupt.
So beware, there is madness on both ends of the spectrum of this hobby.