Forget adjusting charging timing to sit in a "cold" soaked pack.
I'm not sure I understand this comment, but I agree with the rest of your post.
We let the car battery drop to 30-40% SOC from use before we charge it back up to 80%. Charging is set to start at 5am and performed outside in the summer. This is the coolest time of day and about an hour or two before use. I thought about asking my wife to recharge when the SoC hits the 20-30% level but that provokes range anxiety.
I think most of us can agree that heat is a first order cause of degradation for all electronics, batteries even more, and acutely so in the LEAF. It is almost painful to think of the LEAF owners in hot climates who thought they were taking care of their cars by parking in closed hot garages every day and charging the battery to 100% soon after parking.
As much as I am a harsh critic of Nissan, I do think that the 2013-2016 24 kwh packs can be reasonably expected to last 8-10 years if they are pampered and in mild climates. The jury is out on the 30 kWh packs, but it is not looking good.