I follow, but still disagree. Not every country replaced their basic infantry rifle, but many did. The Inf weapons tech only has about 3 levels , dated 1918, 1940 and 1942. This represents the addition of Semi Automatic Rifles, upgraded machine gun variants, handheld AT weapons such as Bazookas / PIATs, and Assault Rifles among other changes in small arms technology such as improved mines, improved grenades etc. I would prefer it to be broken down into smaller techs for pure realism's sake, but as an abstraction it's still, at least, representing a genuine upgrade of significant quantities of the small arms of a given division. It's fuzzy at the edges, I agree, but still significantly less problematic than this example because you're not replacing all of the equipment for a side-grade.