Some people want one color that all brackets use, some people want the bracket to be the same as the bracket being emphasized, some want contrast between the two to make it easier to see. I run into a problem were I can’t please everyone with styling, so the easiest way is to make it completely configurable. If I make it simpler for you to style it in your way, it may make it less simpler for people to style in their way. So I make it basic, but straight forward. Create style profiles and assign them to one or more brackets.
You don’t have to create separate style profiles for every bracket. You can create just a couple and assign them to multiple brackets. You can remove them all and just use the default one.
On top of that, changing the colors isn’t something you are going to be doing everyday. It is one of those things were you tweak it the first time, and then you forget about it. If it was a task that was going to be done everyday, I can see where it would get troublesome, but really, this is something you should tweak how you like and forget about it.