It depends on fighting style. Ruby possesses a semblance that's both powerful and flashy, so you often see her use it only for really flashy finales. Weiss' is a more versatile and simpler one, that allows her to use it almost constantly, and Yang's semblance is passive, while Blake uses hers as a utility.

The main team already gives you four different ways you can make a semblance. Jack falls into Blake's category, but the upgrade I'm thinking of can double it as Ruby's category too.

[@Eklispe], I think you just limited your Semblance a little much but that's it, it's actually pretty okay considering your character. Imagine doing a diving kick with hugely buffed gravity? The impact would be insane. Several seconds at a time is plenty when you consider how quick a kick can pass. Even in straight combat, you can give some of your blows defense-breaking properties with it, and you can even use the gravity to extend your jumps, or make yourself fall faster, or slower, you can lock someone down with it too. Gravity is pretty strong if you know how to use it.