The point is to show off nice effects. Burning arrows aren't exactly fit to spent light anyway.
Ah, I see.
Ok. This will be my last "grumpy guy complaint".
I am really sorry. but...
The thing were people want to show of nice effects in games and movies just for the sake of showing nice "epic" effects: really rubs me the wrong way.
I think it is one of the reasons that there are so many horrible single player experience in AAA games these days.
The developers use way too much of their resources on effects that they could otherwise use on better dialog, story, map design, gameplay, etc.
It's not only the waste of resources. It also just looks really dumb.
This video (from an even more grumpy guy) portrays what I mean really well:
This all just comes down to personal taste though.
I understand why people want blow up buildings and set fire to everything in games. It is fun.
It just quickly becomes too much in my mind.