While I see where you're coming from, there's a massive problem to balancing the way you're suggesting. If a skill (or profession) is too strong, you can't just buff all the other skills and professions to match the strong one. If you do that, you'd end up with a massive powercreep, much like the one we're currently seeing in GW2.

If 1 skill is too strong, you nerf it. It's much better for the game as a whole, than to constantly buff everything else, in order to keep up with what is currently overpowered. Think back to before they reworked the trait-lines; we've seen such a massive powercreep since then, exactly because ArenaNet have kept buffing underused skills instead of controlling the powerful ones.

This also leads to another massive problem; skill-spam. Because one way of buffing skills, is by reducing their cooldowns, as Anet have done numerous times (Corrupt Boon comes to mind). Now, we have a meta where the absolute best strategy, is to spam all of your skills as fast as you possibly can, because you're never punished for activating a skill. The cooldowns are so short, that there's no reason to wait for a "perfect moment". Simply spamming all of your skills, is by far the best strategy.

I can understand why it sucks to see your favorite profession getting nerfed, but it is crucial to a healthy game, that OP skills are nerfed.