Well, you didn't use the AK, but you did actually use the StG-44 according to wikipedia.
There is however still the problem that it was not in production anymore, Iran also still uses F-14s but they are becoming fewer and fewer because they have to cannibalize them to get spare parts. In most cases armies also do not want to give rifles to half of their infantry and completely different rifles to the other half of their infantry. With fewer than 500,000 StG-44 produced and probably even fewer available after the war, no serious nation could have equipped its entire army with StG-44s and thought that this was a somewhat future-proof equipment. I wouldn't even say the AK-47 is worse, it has quite a few advantages, but to cite the number of users as proof given that one rifle was basically limited in the numbers available is quite odd. It's a bit like saying the VW Golf must perform better than a McLaren F1 because it has more users.
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