Yes, a little bit, but I think this is more a character trait. Like, water is her native element, so she’s comfortable there and Earth is about being centered and unmmovable, which Korra doesn’t always have the confidence to execute.
We’ve been assuming she’s been having trouble with Air because she doesn’t have the spiritual connection required to master it, so with something like Fire that comes from a super-aggressive and angry place, it somehow makes perfect sense that a confused/angry/almost-Avatar is over-reliant on Fire in combat.
It’s also a great dig to the M. Night “they need a source of fire” damage he did to A:TLA. : ) But I doubt that’s intentional.
-Da7e-
An anonymous Tumblr user also just sent this, which also makes sense:
“I think the reason she uses Fire more so than the others is because when she fights someone there are no Water or Earth sources near by. Even if this is an Earth source, it is quicker to use Fire.”