It's an interesting conundrum- maybe they want to avoid another "Batman Arkham City: But With Gloves!" Incident, where people thought the system would only get shit ports spammed. Also, that possibly could get a large influx of games during the holidays, under the guise of "look at all these games on the way!"
We'll see if this benefits them in the long run.
I think this is more of what there aim is.
There are ports on the Switch, but besides being handpicked, I think there is enough new games and enough new content to get people excited about the system. Even in upcoming games we know about, it doesn't feel like there is much stuff in the way of just "same ol'" ports but stuff that feels like it belongs on the system.
Ports are good and I doubt Nintendo would turn down even a vanilla port of something like GTA V if Rockstar really wanted it, but besides the reality of a scenario like that being very unlikely, I think Nintendo highlighting what is new and highlighting how games can be a good fit for the platform is a much better strategy than looking desperate for any game that developers will toss their way.
That desperation on the Wii U just created all sorts of poor scenarios for the platform because Nintendo allowed 3rd parties determine the perception of the console, and a lot of that just made the console look bad, even when it was getting games.
