I note that the writer has not touched on the logistics of supplying the various different types of ammunition, which might be a useful addition, even if only to argue that its not an issue.

Off topic, but there was a proposal many many years ago when we were armed with SLR's (FN 7.62) to ditch the sections single 7.62 GPMG and replace it with two Brens per section, recalibered in 7.62 and using a common (prepacked/disposable) magazine that fitted both weapons and infantrymen would carry extra magazines instead of link.

Section Commanders liked the idea (as far as I could tell) because it gave them two identical fire teams and it was felt that the ease of use of the Bren made up for the slightly slower rate of fire caused by Mag changes, it also simplified resupply and "load balancing".....but the proposal was squashed.