I rather think that the key factor would be maintenance problem. The more different equipments the bigger the headache for those charged with maintaining equipments in working order.
If I consider the exemple of ww2, official look didn't depended on the type of equipments. German garrison troops had been issued all kind of equipments from all occupied countries. However, less of these captures equipments were issued to front line units. So much for the official look of things.
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