This is why I think ED does not reward experimentation on big ships. The large slots are simply there for shields and SCBs and not much else.
On that part i do agree. What i wrote also was not for pure hull tanks. I am sorry if you got that impression. But even if we'd have HRPs of all sizes, shields would still be better. There's no way around that, unless the big HRPs would be crazily overpowered, which then again would open a different can of warms.
As long as HRPs are scaled along the pattern FD currently uses, bigger HRPs just won't be that attractive and wouldn't be of much use.
So should we have them? Maybe. I wouldn't mind, although i also don't wish for it. But i think that the benefit would be very limited.