Racing is about winning, right? So it should be always beneficial to be going the fastest. You should always have the pedal to the floor and be able to win, because that's what makes you go the fastest.
...No, absolutely not. If you're always flooring it and you try to make a turn, you're gonna spin out and crash. You need to have the presence of mind to slow down in order to make the curve, even though you're not going fast anymore. That's what makes racing interesting, you need to have a balance between pure speed and control.
By the same logic, Regicide is interesting and fun because it's a subversion of the usual "kill-em-all" strategy. You need to be able to kill people, but you also need to smart enough to know when to engage and when to hang back. You're basically complaining about being asked to use your brain, you know that right?