I would not agree that it is either one or the other. It is not that black and white. Here is how I break out how the AF evaluates people, at least in the B-1 community. The guys/girls that are in either group #1 or group #2 are the ones that get promoted and have above average careers.The people from these two groups form the leadership of our community.
1) WIC grads, OG & Wing Exec
2) Non-WIC grads that are good at primary job and still get the admin stuff done. (CFC, Party Planner, etc)
3) Guys that are great at primary job of flying, SOF, etc, but don't lead anything
4) Guys that are average at their jobs and do nothing extra
I never see the guys in group #1 planning Christmas parties or doing CFC, etc... They don't have to. They are considered the tactical experts or have high visiblity Exec jobs that keep them very busy. As long as they work hard at their primary jobs, they will progress and be near the top of the strat pile. If they can be the squadron patch and also lead projects around the base, they will be considered a superstar.
If you are in group #2, you must be good at your job, attaining at least some proficiency (instructor, evaluator, not a dirtbag) but you don't have to be the absolute best in the squadron either. As long as you meet this bar, you are good. Be good at your job and knock out a lot of admin stuff to help your CC and make the squadron look good.
The mistake many guys make, that don't want to go to WIC, is to try to be in group #3. It is not enough to be the very best pilot or WSO in the community. You will not be rewarded for knowing more than every single person in the squadron, or taking that extra deployment. When these people don't get promoted or get RIFed, everyone is shocked because they are seen as the backbone of the squadron, but this is not what the AF rewards or promotes. After you become good at your job, don't spend all your effort on being the best, you should back off a bit and aim to be in group #2 by volunteering to lead some projects. Unless you are a rockstar and can be the very best at your job and still able to knock out important taskers for the boss.
Guys that are in group #4 usually will have a below average career and may not get promoted or may get RIFed.
I'm sure I will take some spears from others for this but this is based on my experience in the B-1 community. I realize that some guys will say this is BS and that you should strive to be the absolute best at your job and to hell with everything else (group #3), like Joe1234. This is valid, but if you want to stay in for a career, it will be very difficult for you to go this route and you probably won't be the CC.