system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Why don't people just spam stupefy and bombarda when duelling?

I was rereading Harry Potter and it seems like there's quite a variety of spells being cast in battle. For example, the leg-locker curse and the jelly-brain jinx.

I know Avada cannot be successfully cast unless the person is intending to kill. That being said, why don't DA and the Death Easters just spam stupefy (to capture) and bombarda (to ham)? Why is there such a large variety of seemingly less effective spells?
gpt
Something to consider is that versions of protego are able to stop stupefy and bombarda. 

If you look at more complex duels like Voldemort and dumbledore in the ministry, it’s harder to protect yourself from things that are out of the ordinary like being engulfed by a sphere of water. 

The more atypical a spell the less likely it is to be easy to thwart.