:S
All you need to do is go to a Trader and UP convert your excess whatever to something higher grade. No point dumping anything into space when all of it has value as a conversion to another material or data item.
Even if a capacity of G1 something only gets you a handful of something higher grade, that is more of that other stuff than you had before.
I think the new system works just fine, and the capacity alert (s) definitely serve a purpose for those who are using the new system properly.
I like knowing when I have capped out something, because I can go turn it into something else. The Limpets will also ignore any materials or data you have maxed, so there is also that new feature where while collecting stuff from a debris field they avoid/ignore collecting anything you have maxed out.
Nothing "Poor" about the design at all! You just aren't using it properly. If you are tired of seeing the alerts, then go do something about it!