For me it's just a case of A-rated for defensive use and for one-off combat and bi-weaves for ships that are intended to ongoing combat.
Basically, I bung bi-weaves on all my combat ships and A-rated shields on everything else.
*EDIT*
Suppose it's worth mentioning that the whole "reboot/repair to 50% shields" thing means you can use A-rated shields for extended period of combat as long as you can get a chance to do a reboot/repair.
Personally, I don't rely on this 'cos I consider it an exploit and I can't help thinking that FDev are going to remove it at some point.
If your shields are down when you reboot your systems, they shouldn't magically obtain the power needed to recharge them.
They should reboot in the same state they were previously.
So, an exploit that was intentionally added, changed in the beta, and in the patch notes? They made it so you have to sit still to get the recharge while doing a reboot/repair in the beta. It isn't going anywhere. Working as intended.