Re-use your Gradient design on other sections (same site) by clicking on the +Add button next to the My Gradients/ My Fluid Gradients.
How to add Gradients?
Open Editor X > Add/ choose a section > Open the design panel in the inspector > Make sure the toggle is on> Click on ‘color’ > Choose one of the 2 Gradients tab> Play around
Well, I’d say use the code method in any case where you want the animation, because you’ll probably have kuch more granular control that way than if they implemented that level of animation…not to mention that may take a while to implement as I’m almost sure they’re working on some sort of animation update.