You’ve heard of no true Scotsman, well that’s compared to me, the only true Scotsman. Everything I am is all things that are forever and not, therefore the fallacy isn’t.
Each gun requires training to use optimally, each gun requires different parts to repair it, each gun has different reliability issues. The reason any military limits the type of firearms in use is to reduce logistics cost and complexity. If you have one main battle rifle in use that’s standardized across the military, you don’t need a million training programs, you need one, you don’t need ten billion supply chains for replacement parts, you need one, and you don’t have to keep track of what soldier is trained in what guns beyind their mos.
Militaries are just logistics companies that get to kill people. Simplifying logistics then allows them to kill more people.
That was literally every instance of employment your parents and their parents and so on did.