Yeah, that would be the one real success in U.S. Army small arms development procurement of 150 years (I consider the choice of BAR as an inferior choice compared to handing out a
Lewis gun to every squad instead). Moreover, the design phase was quite botched; it's long become obvious that they should have gone for the other calibre.
You don't consider that BAR and Lewis/Bren/MG34/42 are weapons fitted to a fundamentally different rifle section doctrine.
First one is 'French' (since French introduced it) where LMG supplements section rifle firepower helping them maneuver. In other, let's call it 'German' (since Germany pioneered it) section main firepower is a LMG.
US always stuck with 1st, even today, new Marine org being pinnacle of development.
Rest of world varied, I personally prefer 'German' version with a proper belt fed LMG, but both have own merits.
For the US, especially considering abundance of semi-auto rifles decent slimmed down version of BAR would be pretty good.
As for mag capacity, ZB-26/30 also had 20 rounds mags yet none complained.
You also don't consider the fact that US had abundance of the support weapons at Plt and Co level that most other nations lacked.