Standard 40 amp 240 is fine in the home, time is not an issue here, it is the on road L2, here in Canada most every one is 70 to 90 amps.
Adding to the fact I stated that the smallest L2 in Canada universally are no less then 70AMp (Average being 80 to 90A) (I'd wager it is true in the states as well) the 12Kw capable charger is perfectly logical in preceding a larger battery.
You appear to be confusing DCQC CHAdeMO with L2.
You are correct that higher kWh battery vehicles will need faster charging.
The Tesla S has that, both option of second on board charger and very fast supercharging.
But if Nissan builds a 48 kWh vehicle, unlikely the on board charger will be upgraded past 10 kW.
Most homes will not support more than that.
For higher than that they will depend on DCQC CHAdeMO which currently goes to 50 kW, about 120 amps.
And a higher capability DCQC CHAdeMO is proposed.
No I am not confusing any thing, you how ever seem to be. for the sake of goats I gave you voltages e
again HOMES DO NOT NEED TO, I spelled this out as well!!!!!! The point
usability, this is where speed is king, right now for a long drive I need to plug into an L2 mid way for well over 3h, longer is best to fully recharge with a 12kw charger would be a meer 1.5 or less if not going as far. This for the average person doing a quick top off will be even more useful, now for a coffe n snack they have significantly more usable range. Basically no matter what it is all win for us and Nissan.
Homes, standard 40amp 240 volt evse (Charger can be ten gigawatts but it will draw what the evse says it can!)
L2 in Canada is all ready min 70 amps 90Amp average at 240V (On-the-road values)
(V*A=WATTS 240V*90A=21.6KW) Hmmm seems to me just a tad over the needed capacity there! So with a 12Kw charger we'd have 9.6Kw of head room on an average L2 in Canada! (They built them for the teslas higher charge rate abilities and some future proofing!) the U.S. I'd assume they'd manage the same 90Amp standard!
Fast chargers would be glorious! had we any actually installed in the rest of Canada (They are either in Vancouver or Quebec, not much any where ells of use for the bulk of ev drivers out here)
So again the cheapest solution for Nissan to add a huge factor of convenience and usability would be to put in place a 12Kw charger, or hell even a 10! as every L2 charger in Canada all ready exceeds the needs by 9.6KW!! on average!
As you all ready agree with bigger battery we need a bigger charger we are on same page there.
You are errantly connecting battery charger with Ampacity, I think you are geting hung up here, the evse tells it what it can draw, so the home can be 1amp evse if you wanted or a 200Amp (48Kw) mind you nothing ells in the house can be on!! (Average new home in Canada is 200Amp 240V service)
So there is all ready this flexibility in the system, so Nissan will be wise to take advantage of it, and we will gain tons!
2013 SV Leaf, Level 2 charger, so far all works great! 130Km daily, 100% charge at night on 240 then trickle charge for 8H durring the day on 120v.
Level 2 charge starts at 130am environmental starts at 6am to 25c for a toasty warm defrosted car!