Arc Ultra ultimate immersion setup would be great for movies but what about music?

Until now, I had a JBL Bar 1300X wich comes with a huge Sub and wireless surrounds as my home theatre setup. I really don't have experience with anything else before that and I enjoyed watching movies with thumping base and Dolby Atmos surround sound. For music, I have a couple of Era 300s paired with a Sub mini, which is crazy good to me.

Now I sold my JBL setup and pre-ordered the Arc Ultra and Sub 4. I will also pair my Era 300s as rear surrounds. I know this is going to be a killer setup for watching movies, but how does this ultimate immersion setup comares to just a pair of Era 300s and a sub for listening to music?

Is it ok to leave the ultimate immersion setup as is for movies and music or when I'm done watching a movie I should unpair the Era 300s as surrounds, move them to the front and use them for music listening unlinked from the soundbar?