I think that would be confusing, because We’ve been calling the version that came out at the same time as the V3 hub the V3 app for that reason. Because this is actually the 4th major release. There was the hello home version from 2013, then the classic app in 2015, then the V3 version in 2018, and now this one.
If you want the whole history (with pictures!) It’s in the following FAQ, which obviously needs to be updated but that will have to wait for the iOS version.
And the problem with just saying that now this one is “the“ app is that there is so much information in the forum and a lot of it remains useful for years, but the app versions can change over that time.
We started calling the previous version the V3 version because there were a lot of posts in the forum talking about the “new“ app which meant the “classic“ app: new as opposed to the original hello home app.
And there are always lots of questions at transition times like this and people are going to say “new app“ to mean this newest version.
FAQ: how to tell which version of the SmartThings mobile app that you have