You really don't understand how a military (or any organisation) works: assuming 100 standardisation of logistics and procurement is like thinking every soldier goes into battle with ceremonial uniforms.
This is the schism between Star Wars fans in this respect:
Some think the Empire should be like a real military organization and be realistic, with plenty of providers, diverging opinions and tactics, and multiple idiosyncrasies, especially for a group that spans hundreds if not thousands of star systems.
Some think the Empire should be like the Foot Clan in TMNT or basically every evil organization where their assets and henchmen follow some aesthetics to the letter, that must be immediately recognizable, their members basically doubling as icons of their masters.
You've hit the nail on the head there, and these are very mutually exclusive options.