They've shown Phaser proof barrels / containers in many phaser fights.
Why couldn't they have used the same material as those barrels / containers and make either small scales or plates and mount them like modern body armor?
Interceptor armor has large plates for front / back.
Dragonskin is based off of lots of tiny discs arranged in a chain mail esque fashion.
Either way would've protected a person from energy blasts in a fire fight.
It makes no sense.
Worf was able to make a temporary shield for that Holodeck malfunction episode.
If they took the time to build a proper portable one, it could probably take quite a few hits before going down.
The sheer number of redshirts that could've avoided dying due to energy blasts.