It is a little US centric would be my only compliant. They show some curious rifles as well you can see a G98 with a trench magazine at one point but they never mention it.
Also they barely mentioned the SMLE which is a bit of an over site it being arguably the best suited design bolt action rifle for trench warfare.
There are many obscure WWI firearms several countries did produce semi-auto rilfes during the war never very many of course. Likely also cost of production as well. It is easier to produce a bolt action in large numbers vs a semi-auto.
This is why the Soviet Union went from Mosin-Nagant 91\30 to SVT38/40 back to Mosin. It was a production thing they could make more Mosins and the SVTs had draw backs as well they could get fouled up by dirt and due to the light weight wood used to make the stock they have a strong recoil.
So after Barbarossa at the end of 1941 the Soviet stopped making SVTs in large numbers until after the war ended. The original plan was to convert to the SVT in 41\42 while also improving it. Which is what the Germans did with the G41/42/43. German troops on the Eastern Front also used SVTs that they captured.
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