Go ahead and ask that question, but there's absolutely no need to be condescending and passive aggressive about it.

I've NEVER heard Blizzard say they won't reshuffle or balance low-level abilities because it'll directly affect performance at level cap. The closest you'll get to this is that spending time balancing low-level abilities - especially those that are in some cases only unbalanced when combined with heirloom gear and maybe only at certain levels - detracts from balancing max-level abilities, which to them is a lot more important.

They won't balance classes in PvP at lower levels. That's just ridiculous and requires an insane amount of extra time devoted to balancing.

@Smashbolt:
Actions speak louder than words (as exemplified by e.g. the upcoming buff to Explosive Shot, when Survival Hunters are already unbalanced enough pre-cap), but even then in the past they have said that altering the way certain abilities work would impact end-game.

@ also Bellatjok:

Nobody is expecting perfect balance, but besides the balance having been better before the Cata Talent revamp (notice: better is a relative term, again: nobody is expecting perfection), the current situation would already be much helped if they just sat down, made an ability grid, compared the number and types of abilities certain classes have at certain levels, and see within less than an hour that it doesn't make much sense to e.g give Hunters Wingclip, Disengage, Concussive Shot (with a longer duriation than cooldown) and Scattershot in the 10's were Warriors nowadays get their Hamstring in the late twenties (and Warlocks Sacrifice also in the late twenties).

I 'get' that Hunters after all these years now suddenly needed Shot-on-the-Run and that as 'core ability' it is unlikely to move to the level where it's actually 'needed', but I have yet to hear a decent argument why balancing the levels at which classes get certain skills better than currently would be particularly hard, esp. for a company as big and rich as Blizzard.

Also:
with the 'Play WoW for Free' ads plastered around the net to draw fresh blood, and the dwindling number of WoW subscribers, the laissez-faire attitude towards the PvP experiences people have when they try WoW should perhaps better change, especially because with the fewer number of abilities it's actually easier to balance in the first place.

(of course the WSG GY screw-up affects all levels; the old map worked well enough for years, now a day doesn't pass without irate subscribers complainting about it)