Me, personally, I prefer square for these type of creations.
Just posted about this! I think it’d be nice to have the option. People who post the entertainment may prefer the square, but as an editor I think I’d prefer to have the 1080 x 1920
While personally, I prefer square creations, I think it would also open up the floor to more creative ideas if v2 gave you the option to do either (similar to Instagram).