As above, depends what you prefer, maybe someone just got bored of it and converted it, or liked the car but not the setup. Thought about converting mine but changed my mind.
RE; the launch control kit, don't have much experience with them TBH, maybe you're better off putting up a seperate thread about it. If you think you "need" launch control then install it, personally i wouldn't bother, but that's just me, you'd use it for a week then get bored of it.