Adding to that has.been is that they cover pretty much every period gamers play.
Also, as it gives you a playable set, you are free to introduce
your own rules to cover your game.
My Home-brew WW2 rules cover the basics.
Then if playing Winter Russian front we include a few rules about snow.
No need to study up on:- Crossing sand, monsoon & how it effects road
movement, foggy days etc. etc.
K.I.S.S. (Keep It Simple Stupid).
