its easier to keep track of then Hit Points. Which may I point out is a meta-gaming tool that ALL RPGs use.[/quote[Just off the top of my head, here are some RPGs that don't use hit points: Marvel Heroic RP; Burning Wheel; Maelstrom Storytelling; Hero Wars/Quest; and Rolemaster and HARP, which do have concussion hits as part of their damage mechanics but (i) rely mostly on debuffing condition infliction to model the effects of being hit in combat, and (ii) clearly treat concussion hits as "meat" (bruising and blood loss) and not as a D&D-style momentum/victory marker.
I don't know anything about the 2d20 system other than what I've read in a few threads, but the idea that metagame mechanics are something to hlep inexperienced GMs/players "spice up" their game is not something I can agree with.
Metagame mechanics are one way of distributing authority over the content of the shared fiction. Whether or not they are desirable or useful has nothing to do with "experience". (Eg BW has metagame mecahnics - fate points - as well as an expectation that, if a check fails, the GM will narrate the failure in a non-simulationist fashion (eg the failure results from some dramatc external cause interfering with the attempt); but I can't imagine very many inexperienced RPGers picking up or playing BW.)
Because the mechanics help and
ENCOURAGES story-telling, and more enticing combat. Less experienced GMs and Players could really use tools to give them that extra push. Otherwise you can get in that trap where all you do is "Attack and deal Damage".
Any inexperienced Gamer can pick up a rule book and play. It can take years of experience for a GM or a Player to reach a certain level of creativity and comfort at the table to be able to play a very basic RPG and make every scene "exciting".
If you have played Star Wars Edge of the Empire, you would understand just how much Triumph and Despair (and Destiny) adds to the story. The game mechanics in a way
force or
push you to come up with creative story-telling elements and thus enhances the experience.
That being said, even experienced GMs can benefit from said tools.