I ment more modular as being able to go light with no armor, to keep cool and mobile.
Your vest is some sort of a replica of a heavy body armor that is hot and cumbersome.
Take a look there:
http://www.airsoftcanada.com/showthread.php?t=92185
You will find a lot of pics of what I mean. Especially in the last pages. Lot's of chest rig and body armor.