The "general" problem with game expansions is, the game comes out with "basic" rules.
At this time, the scenaro designers really didn´t know, what ideas they have 5 years later, so they can´t foresee, how later expansions/rules works with earlier setups.
You can see this circumstance very good with Memoir 44 with the most expansions/rules of all C&C games during all the years.
Later rules/expansions shows then "mistakes" or revised rules wich ending in a FAQ then (and in MM44 the FAQ is thick as the phonebook of New York)