^ That's a bit of an exaggeration.
Weapon development is a strategic aim. Why did the US stay with the M4 and M3/M5 tanks for so long even well after they'd be eclipsed in capability by German tanks? Because, for one major reason, they were easier to ship and maintain overseas than bigger, better armed tanks would be. The Army wanted numbers, not quality. That's a strategic decision to make - as is the French/British practice of dispersing their armored forces into the infantry divisions instead of massing them together like the panzer divisions.
These are not operational or tactical concerns - they are very much strategic ones involving production, transportation, and doctrine.
I agree that there is some bad micromanagement in HOI2 - the espionage system springs to mind. Some features, I think, would benefit from optional micromanagement (I stress optional) and some would benefit from more optional automation (HOI3's spy system, if there is one, could benefit from the lessons learned of EU3's merchant system).