Having gotten the chance to read a lot of late-WWI and early interwar doctrine pieces, one thing struck me in particular. Not the focus on trench lines or the different communications with no radios, but the presence of “1 pounder guns” like this.
The 1-pounder was described as being meant to hit targets like machine gun nests and armored vehicles. It was almost always intended to be used for direct fire. In other words, it filled the same niche that far less clunky recoilless and rocket launchers did in World War II and beyond. I found that interesting.
(And, of course, the widespread use of light AA guns for ground attack means even the original concept hasn’t gone away. That the pom-pom was also one of the first effective AAA pieces means the connection is even greater).
Fuldapocalypse Fiction 
The Japanese hung on to their 37mm equivalent of the pom-pom, the Type 11 infantry gun, until the early 40s (and they probably continued using them in China). Later they used the 70mm Type 92 battalion gun, as something more accurate and heavier than this or the 70mm infantry mortar.
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