Another thought: "Anonymising" units. For example, in a PBEM, have both players to rename their units so that for example you'll see "T-54/55" instead of say T-54B or T-5AM; "T-72" instead of T-72M or T-72A, have all leg-moving squads bear the name "Infantry" or "Inf Section", smaller units (scouts, FO) "Infantry Team", atgM/Law/RPG/RCL becomes "AT team" and so on and so forth...
Makes you paranoic if you don't know whether that "T-72/ERA" on horizon is T-72AV or T-90
Just got an idea how it can be implemented OOB-wise, but will have to work (and think) on it for a while.