Soldato
The older Zoe can ONLY charge using Type 2 AC. This is fine for charging at home and on older Fast/Rapid chargers, but many newer charge points (e.g. from Ionity, Instavolt) are installing DC only chargers, which can't be used by a Zoe at all. 7kw destination charging is fine if it's actually at your destination, but it's not really practical to stop for 4-5hrs to charge on a 3 hour journey if that's the only option .
Regarding the ChaDeMo on the Leaf, this wouldn't be an issue as it would only be used for short journeys within range, leaving the ICE for the longer journeys.
Zoe is 3 phase though so you can get Type 2 upto 22kW just like you say tends to be DC CCS in UK where as Europe main land is fair more aligned with domestic and commercial 3 phase.