The way of loading had changed for sure. The rifles were top loaded in that worst-of-conditions war and stuffing mud covered clips into an open action...as you well know, isn't good. With the advent of the contained magazine and bottom loading things changed. We might have had some more results from the Browning Auto Rifle if it had seen a couple years use. I don't recall ANY user results at all, don't think it even made the war. All the pics I remember are Val Browning demonstrating in 1919.
I remember an FN giving me some problems in sandy-snowy-wet conditions. It was reluctant to close completely but with some effort it still worked.