From: Leeuwarden, Netherlands
I agree with your perspective on Inf guns. First of all they were available at the time, so why not put them in the game, if only for flavor. Secondly, they really are killers and give your Inf units extra punch. Add even some Mortars, Mguns, AT guns and Bazookas and you have an Inf unit that does well *everywhere*. I find that placing some AT guns, at least 2, in an Inf unit stops the enemy armour cold, especially when you place that unit in forest/cities/hills.
You do realize that Inf guns use up supply as well, so it is possible to completely outproduce your core cities' supply production. I've had games where I had to shut down most of my factories because I couldn't produce enough supply. Ofcourse by that time the game is almost won.