Thumpalumpacus
Major
Especially in war games/computer games, sometimes unlimited ammo, doesn't need to reload, sets up and breaks down in seconds. Towed stuff is even worse, nobody wants to spend 15-20 turns setting up.
View attachment 701673
In some games you could drive up with this and fire the next turn
In that game Wespes had six or seven shots before reloading, no unlimited ammo, but the fact it was mobile meant in game rules it could provide defensive fire immediately for any directly adjacent unit. No need to uncork the gun, made it really nasty on the offensive where they could pile up against you and have immediate arty support. You'd better have air.
Panzer General game engine, same basic rules.