I actually own and operate a Quasar with a Leaf and I can assure you that the Quasar 2 is a paper charger, ie it is not in production.
The Quasar 2 would need to be programmed to be compatible for individual models or model series but not a single EV manufacturer has taken up Wallbox on their offer to make it compatible.
Without a universal CCS bidirectional protocol, the Quasar 2 is dead on arrival. The CCS protocol is struggling as it is with unidirectional due to differing intepretations leading to failed handshakes.
The Quasar 1 however, is available for purchase.
This isn't unique to Chademo. CCS does V2X perfectly fine, as does NACS (since 2020). This isn't a reason for offering Chademo.
On multi-plug dispensers, if the CCS connector is down, then the Chademo connector is also down. The only difference is in the plug, and nothing about the Chademo plug makes it more resistant to damage or outages than CCS. Once again, this isn't a reason for Chademo. It's a reason to have multiple cables per dispenser, but there's no benefit to having Chademo on there over CCS or NACS..
Chademo ports are only installed for the Japanese market. Chademo lost when it came to choosing the global standard. Chademo is on its way out in Japan, too, it's just early, still. While this is the only argument of yours that actually has any merit whatsoever, it's still not a strong argument. Adding a Chademo port to the Ariya isn't trivial for non-Japanese markets from a cost perspective. The cost per customer would be higher than many would be willing to pay, and the complexity it adds to the production line is just not worth the hassle. Besides, the world is attempting to standardize around CCS already, and throwing in more Chademo cars would only slow that down (even if I personally feel like NACS should have won out, if only Tesla handled it proper from the beginning).
The current CCS protocol does not allow any type of bidirectional charging. CCS charge controllers are not built to do it and while Volkswagen promised to give all 77kWh battery cars bidirectional capability somewhere in 2022, it isn't happening, it's not that simple.
As a Quasar operator, I can tell you that even the seasoned Chademo bidirectional system isn't without its share of bad days.
As an EV driver of long date, I can assure you that I've seen countless chargers where the CCS was inop but Chademo was working fine, mostly due to damaged plugs, sometimes charge controllers that wouldn't work.
The plugs are sturdier on Chademo, mostly metalic, while CCS is usually hard plastic and all it takes is a few drops before the plastic chips away and the pins get exposed.
Chademo is not on the way out in Japan and neither is it in Europe, more and more chargers with Chademo are being installed at almost the same ratio as CCS. Of course, the opening up of the SC newtork is big for CCS, but CCS chargers are lagging EV sales big time, charging queues on busy routes/days, etc...
Go to countries like France and you've got an entire network of hundreds of legacy 50kW Nissan chargers that do 43kW AC and 50kW Chademo but no CCS.
Bornes de recharge Nissan
I can and have driven across Europe in a 14kWh Leaf (21.5wh Leaf with 30% degradation)
I've seen plenty of CCS drivers turn away after they failed to initiate CCS charges, having both would not be a luxury, it's a necessity in the current charging landscape.
I once limped to from a broker charger to a supposedly broken charger (according to recent chargemap reviews) arriving to the second charger almost in turtle mode with no alternate chargers within 50 miles, CCS was broken alright but Chademo worked and saved me big time.
Last but not least, the way things are going now, Ariya production ramping up too slowly despite chips not being an issue anymore, Model Y price cuts against Ariya price increases, hundreds of new EV models hitting the market, the Ariya is doomed if they don't offer something unique.
The big battery 88kWh is a lot of battery, 6 Powerwalls worth and costs much less than 6 Powerwalls too.
You could power a castle with that.