I think the point made is that until superchargers become more frequent overall and especially on secondary routes we will need to consider larger batteries to supplement that. At the same time though you can’t really go too much below a certain threshold less you sacrifice power output vs draw.
Even if it meant occasionally relying on expensive Electrify America rates I could even compromise switching adapters to where all DCFC capable cars go to CCS (or all adopt the Tesla standard but that has about a snowballs chance in hell)
Honestly, other charger networks rates
seem really high, but Superchargers are still expensive too. Especially per-minute Urban Superchargers, which put you at a similar price to other networks effectively since you're mostly paying at the second tier (>60kW), but only pulling about 70kW.
My recent trip worked out to about CAD$0.295/kWh when using mostly Superchargers, but even some free public charging (probably about 200kWh?) and some very limited use of CHAdeMO stations (maybe 100kWh out of 1203kWh). For reference, the "very expensive" Flo/Greenlots CHAdeMO stations here are $0.30/min, which works out to about $0.360/kWh.
Side note, WTH is with fast-charging prices? They are way too high. I get there's infrastructure costs and such, but it's ridiculous. Do we need government regulations like for home electricity? Do we need to adopt the gas station model and have other revenue streams on site (e.g. convenience store)? There's gotta be a better way, it's close to the cost of an efficient gas vehicle while charging at home is
way cheaper (even considering the cost of charger installation, if that's needed).
Anyhow. More chargers, yes please. I can pretty much get around even the more rural parts of my province comfortably with CHAdeMO at this point, albeit slowly.