AmpedUP - I think you might be looking at the pre-2017 FFE. The new Focus Electric has a CCS connector. Yes 6.6KW charging in AC. But DC is up to 50KW. So it probably passes what the Leaf can do for charging.
From the Focus Electric webpage:
SAE J1772 CCS (Combo Connector System) Charge Port capable of charging on 120V, 240V and Direct Current (DC Fast Charge)
Permanent Magnet Electric Traction Motor (Focus Electric)
AC Charging: 6.6 kW Onboard Charger
DC Charging: up to 50kW capability
Guess your question is more, are all those stations on the Green Highway equipped with CCS? Can't answer that question - you'll have to research that yourself.
I think you got the evaluation right though - Nissan assumed air could take care of the cooling the batteries enough to not damage them. They were clearly wrong, at least in the early models.
Ford, BMW, and Tesla all took a different perspective - actively manage temperature in the battery. I haven't heard of too many people complaining about significant battery degradation in Teslas, ever (and there are well over 200,000 mile examples with tons of supercharging). I'm not so clear about FFE batteries. The key issue with the FFE battery is the silly guess o meter telling you how much range you have. The only way anybody could know for certain how much degradation there was in the FFE battery was to do a full test at brand new, one slightly later, and then a couple years down the road. And even then, Ford built in a bunch of battery protection, and a person might not get a true reliable test.
Tesla hits the battery with around 100KW pretty regularly during supercharging (at least up to around 60% of battery charge). With all those people doing that regularly, you'd think there would be battery problems. There aren't.
As long as Ford manages the charge rate and state of charge properly, using 50KW should not even remotely be a problem. It will manage the heat properly and not harm the batteries.
Yeah there is theory, and then there is engineering and practical. Nissan made some bad assumptions about how people will charge the cars.
2014 Platinum White FFE (Turning in mid Dec. 2016 25,000 miles)
2013 Ingot Silver FFE
2012 Titanium ICE Focus
2014 Tesla Model S 85