The 22kW charging uses three phase. So, if you wanted to upgrade a car from 7kW charging, you'd need to add 2 more charge modules or replace the original single phase unit with a 3-phase one.
It's a shame the 22kW charging wasn't more widely adopted by car makers, as 415v 3-phase supplies are of course very common on commercial sites.
I'm in the Chademo club too. I don't see anything wrong with it, and can honestly say CCS has no advantage for me with my car. I don't travel long distances where I need to fast-charge away from home, and assume most other people with 30kWh (or under) batteries are in the same situation.
Nissan's 40 and 62kWh packs are a bit oddball to me, as the range encourages travelling further away from the safety of home charging, knowing that public Chademo units are being phased out.
I suppose the moral of this EV story is like always: do your research to get the car that suits your needs.