I think Combat Mission should be a standalone game and all the other games act as modules or DLC people pay for to go along with the bare game. For example, how DCS does their thing.
https://store.steampowered.com/app/223750/DCS_World_Steam_Edition/
I love playing these games but I'm wondering as to why I can't achieve a high frame rate on any battle size despite having a modern gaming pc. I get a higher frame rate on more demanding games on my system like Metro Exodus or Total War Three Kingdoms.
I noticed that in the first level of the campaign you have 7-man sections while in real life the Canadian section consists of 8 men. I did a check in quick battle and noticed the sections also have 7 men instead of 8.