These rooms are beautiful.
I understand why some people might want a more generic wallpaper or art vs. MOANA!!!, but I love it all. I love the colors. I love the furnishings. I love that they look special, not something you can get somewhere else.
I appreciate that WDW is bigger than the characters, and many people dislike the injection of IP at every turn, but if they're going to do it, I think this is a pretty good application of IP in a place where it makes sense. My family absolutely loves the small murals inside the pull-down beds in the DVC rooms we've stayed in. It always felt like a special Disney touch. I love that they tried something and went bold with it here in a tasteful way.
Also for the people saying a wallpaper border would be more subtle -- have you seen any house or hotel or office made in the past 20 years with a wallpaper border? Borders are out of style, while feature walls are in. When they refurb the Poly again, feature walls may no longer be fashionable and they can easily remove it. (If you hate the HGTV-ification of the resorts, you probably hate a lot of popular interior design trends in general. Which is fair. I know architects and interior designers who hate it too. Everyone has different tastes. But certain things sell. Just like how home buyers no longer want carpet or granite. )
This is definitely an on trend decision, which is why I think I like it. Totally my style.
And as you said, when the trend changes they can change it, but it’s nice to have hotel rooms that are matching current design trends.