Most of the G5 data materials you'd struggle to use even 100 in your entire career, now that it's just 5 of them to complete G5.
Abnormal Compact Emissions Data: used solely on long range utility scanners and sensors, and Clean drives. You'd need a substantial fleet to want 20 of those modules.
Adaptive Encryptors Capture: used solely on fast scan utility scanners and long range interdictors. Again, you're not going to need 20 of these and some of them are mutually exclusive with ACED.
Classified Scan Fragment: used solely on wide angle utility scanners and interdictors. Yet again, you don't need 20 of these, and yet again any you do take reduce your need for the above two.
Datamined Wake Exceptions: you could plausibly get through 100 of these on a large fleet, especially if you were using the more expensive pre-engineered SCO drives. Still, a full load of them will do at least your next six ships, probably seven or eight.
Modified Embedded Firmware: only used in one blueprint (overcharged weapon) but it's a good one, so that means that a single ship might use half your storage.
Peculiar Shield Frequency Data: appears in no blueprints at all. If you somehow needed 100 regen sequence beams you'd finally run out, if you also didn't scan any other ships ever.
So that's one almost completely useless, three marginal, one useful but at least only one per ship, and one which will be constantly running out.
That certainly should be reworked, but increasing the storage cap is not the way to do it. Encouraging people to think that they might have a use someday for 1000 PSFD (that isn't "trade it for 166 MEF") won't help matters.