That's still a relatively small list of exclusives compared to say, the Wii, and even then Fire Emblem Warriors and Link's Awakening aren't exclusives and Torna is an expansion.
That said, Switch is a long way from done so over its remaining life it could bulk up and accumulate an exclusives list more in line with what I'd expect from a successful Nintendo system.
Torna was deaigned as an expansion, but became something more and got its own full release as a game. I have the physical game card myself, and you do not need Xenoblade 2 to play it. It is about 30-40 hours long, and by definition a stand alone game.
Full on remakes like Link's Awakening are considered new games, so it makes the list.
You are correct about Fire Emblem Warriors, as I forgot about the 3DS version. So for the sake of consistency, just replace it with Pokemon Sword or Shield.
The Wii is not a very good example, as it had a radically different control scheme that its games were built off of. 3rd parties pretty much HAD to keep Wii games exclusive without making changes to work with a regular controller (till the PS move was released anyway), so it wasn't really worth the time to port. So what you really need to look at is 1st and 2nd party comparisons.
What it is comparable to however, is the PS360 from the same generation. Aside from 1st and 2nd party, most 3rd party games were multiplat. Hell even many 360 3rd party exclusives still found their way to the PS3 by the end of the generation.
So the current exclusive landscape really isn't any different from say 10 years ago, except MS games and some Sony games are now going to PC. Nintendo has been the outlier in all of this, and have not really changed how they handle exclusive content. And given how Nintendo does things, I don't see that changing while they are still in the hardware business.