I think they might be able to port FF15 to NS ... but you'd have to accept several compromises. Likely a fairly big decrease in graphics quality, lighting/shading effects cut down, and maybe a resolution of 540-600p. I guess for Square-Enix, is that worth it ... probably because of the Japanese market and how enthusiastically they'll accept a portable platform like the Switch. Most Western devs though won't bother.
I don't think there is any real hardware inside that dock. All that happens in "dock mode" is the system can likely operate at full clock and power consumption (probably in the 20 watt range, just like the Nvidia Shield console).







