IC...actually makes sence why they started raising in popularity. Trend is coming full circle again!
To look just at the Droid as the platform, and how it could be improved, the fundamental issue is size and complexity. The 'sleeve' to carry all the internal components, passages, etc is just enormous by modern standards. The shutoff spool that resides behind the bolt spool is a great design, but could be wrapped a few ways to really improve recharge rates and still shut off the flow, all while allowing for a more compact package that would be more similar in size to a GEO, or PMR at very biggest. I actually have some really nifty ideas on how to 'tweak' it, but I should keep them under wraps, as they aren't entirely MY ideas, but more shared concepts.
And here I thought you were ghoing to wave the "toolless tear down" and "better milling" flags!