I find them annoying and in a couple of cases the game froze up on me after they happened.
Any time you mess with the code stuff can go wrong, so why try to introduce something that is frivolous?
On the website
Settings > Board and Pieces
Theme Showcase Animations
Game Result Board Animations
For the Android app it's More > Settings > Board and might be similar on iOS
I find them annoying and in a couple of cases the game froze up on me after they happened.
Any time you mess with the code stuff can go wrong, so why try to introduce something that is frivolous?