Unit Description: After meticulously analyzing the G-Line's combat data obtained from a battle in the year 0081 of the Universal Century, the Federal Military Technical Department determined that the firepower, armor, and maneuverability of the G-Line's additional equipment were excessive for the average pilot and unnecessary for a mass-produced unit. They concluded that the RX-78-style unit format was ideal in all aspects: maneuverability, manufacturability, and operability.
The additional armor created for this verification was based on the standard, but was lighter and less powerful, resulting in an economy armor style very similar to the RX-78.

Curiously, the original goal of the "RX-7" was once scrapped.

G-Line (Economy Armor) | ポポロン's Gunpla works