Frozen 2 outtakes! Why?!

I heard that Home was supposed to be the opening song in Frozen 2 to introduce back Arendelle in the movie, but was changed. Also there are a lot of outtake songs like "Get This Right" and "I Seek The Truth". Why were they cut??? Is it just because the movie would've been too long? But I wouldn't mind making the movie longer. It was a spiritual experience, anyway.