Well, what even is the purpose of balance changes? At the most basic level it comes down to three things:
A ) Make the game play as fun as possible. (That's really the whole point of it being a game!)
B ) Promote build diversity and try and create an as level playing field as possible by adjusting outliers. (Choice is fun and this is an MMORPG!)
C ) Change for the sake of change. (Keep the game fresh!)
Usually the balance changes we see should serve all of these goals at the same time. Like nerfing nade holo and kala sustain renegade - they were unfun to play against, spammy, one-dimensional and definitely out of whack. However now it becomes increasingly evident that it won't be as easy going forward. If Anet continues to only nerf the obvious outliers - like shortbow shiro renegade - we will shift even further towards a sustain centric meta, which is slow, unrewarding and unfun. Worst case scenario : Bunker meta where noone ever gets a kill. Heck, duels on a side node shouldn't be a boring chore, an indefinite stand-off between bunker builds! It's latest inception : Side node scrapper. What's next? Water weaver? Decap druid? Defense spellbreaker? When conquest is more about getting the kills and the map momentum it's simply more fun.
However, is the right solution setting shortbow shiro renegade as the new standard for offensive builds - as I've seen suggested recently? Hell no, it's a spammy, one-dimensional build and inherently unfun in the very design that makes it superior to others : Just spam your dps off cooldown until you win. Very short cooldowns on your shortbow skills and high damage coefficients offset the need to time any of it against your opponents defenses.
Adjusting the outliers should not be up for debate. However sustain needs a nerf as well - in a comprehensive manner - so we don't see the next bunker spec pop up yet again.
As a more general concept:
What even is "fun design" in PvP?
Stale, slow 1v1's that draw on indefinitely are clearly counter to both of these premises.
We need to finally find a sensible balance with neither power-crept offense (= button mashing ftw!, like pre-february) nor overpowering defense (= stalemate meta, like it is right now). Can't be that hard to achieve, right?
I still hope CMC can make it happen.
Keep adjusting the outliers and broadly reduce sustain. Unleash CMC.
(edited heavily to make my point more clear)