The Mitsubishi Outlander PHEV's battery is only 12 kWh but it includes CHAdeMO fast-charging in most countries. Why use fossil fuel if you can charge for free?
Having a DCFC port is certainly helpful for a PHEV for a number of reasons - principally for exporting power (world's best home backup generator...) and being able to charge from DC stations on occasion if necessary/useful. It doesn't really cost the company much to add, and it adds a lot of versatility. The Outlander was designed in Japan and I believe originally for the Japanese market, where CHAdeMO originated and has massive coverage most places people go.
However, unless they have a Lithium-titanate based chemistry, they aren't going to be charging an 11 kWh pack at more than 25 kW or so - which makes it hard to understand why anyone would bother during a road trip unless the charging was very cheap (relative to gas) and very convenient.
It's also not a great utilization of a 120 kW Supercharger - unless the PHEVs plug in opposite Model Ss, where they can get full benefit while not impeding the charge rate of the other side.
Walter