That's unlikely. Unity runs at 900p and drops frequently below 30FPS on both X1 and PS4.
Unity is more of a case of bad coding/innfeficient engine than anything power-related.But I do understand what you mean.
In the end I guess it depends on how willing Ubisoft is to port AC games to the Switch.If this rumor is true, then it shouldnt be long to see which games will make up the compilation, since its very likely this is a TGA announcement.
Edit: For a second there I thought Unity had a PS3 version, so yeah, the games you listed seems more likely.Though I do still think that Unity runs like it does because of optimization.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.