I think a better question is what is the point of g1-g4?
1) Frequently in my experience, a G1 to G4 rating is more fit to purpose than a G5 rating. Penalties increase as the rating increase, and in the ships I design, minimizing the penalties is at least as important as maximizing the bonuses. The only module I
ever automatically G5 is the FSD.
2) Frequently in my experience, the bonuses of a G5 rating isn't worth the effort required to get them. IMO, if you've got time to spare in this game, you're better off improving your skills at this game, as opposed to grinding away for hours to save yourself fractions of seconds of while playing the game... especially when getting good at what you're trying to do can save you
minutes.
3) Frequently in my experience, I get more "bang for my buck" from trading G5 materials and data down to get the stuff I actually need.
Or why does "E" rated internals (esp FSD) exist when you buy a ship?
It's a holdover from the early development of this game, before Frontier caved in to the Veruca Salts of the community, and castrated the economic aspects of this game. Once upon a time, when credits actually mattered, E rated internals had one important advantage: they were cheap to operate.
Some aspects of this game needs a logic re-think.
I agree. The Monty-Haul Campaign level of income currently in the game has reached ludicrous heights. I'd like to see the economic sim restored to its Alpha 4 glory; a return of maintenance and operational costs; the addition of docking fees based on ship size; mission and exploration rewards dialed down to sane levels; exploiters being punished for the cheaters they are; and core mining income reduced to reasonable levels.