Pandaplomacy is absolutely a thing. That said, much like in the Cold War, it's good for nuclear superpowers with big armies to have a certain degree of open communication and, if not warm, at least cordial relations. Helps defuse potential problems early, before they turn into news articles.
So, I welcome the move on that basis alone.
On top of that, the move does have symbolic power, as the panda occupies a similar place in China as bald eagles do here in the US. Anything that warms feelings between Chinese and American citizens themselves is probably a good thing.
Simplifies your wardrobe a lot, that's probably my favorite thing about mono-season climates.