I fully agree! It is ridiculous.
How big is a sysII compared to the sander!! So much wasted space. I was also frustrated when they started selling the 18v drills in the sysII, I much prefer the sysI of old. But I guess these days the new larger airstream charger might not fit in a sysI with all the accessories.
Ultimately I would prefer festool to ship tools in the smallest sustainer that they can.