I feel the op is a little over the top on this issue, and overlooking the fact that when the new batteries and TXS were released the backwards compatability with the original CXS batteries was very welcome for those CXS owners wanting to add a second CXS/TXS or new batteries to their kit.
As for the 'air' in the CXS... Who cares. It's about the wonderful for factor of the drill!?
Personally my head scratching question when they released the TXS and updated CXS with the new battery style was:
Now the batteries are notably wider than the original CXS batteries, they look like they could have actually be made compatible with the main/standard/normal festool chargers...
I don't really mind the size of the 10.8v charger, i find the fact that i have to take it means the cxs often doesn't travel to jobs because i can't just grab the drill on its own, it needs to come with it's charger, and at that point i may as well bring the whole sys1. But I'm always trying to limit the insane amount of tools that travel with me to installs, and more often than not taking the cxs systainer as well as the T18.. Well, i don't.
Also seems silly as if the CXS/TXS used festools std charger, it would likely lead to curther cordless purchases by people whos first cordless festool was the cxs/txs. And i have a feeling thats quite a lot of people. And actually that future compatibility potential might even lead to more cxs/txs sales in the first place.