We want a game where minimal changes occur, not one where wild swings are taking place all the time.
Who is 'we'?
Minor changes speak to balance, wild swings are the opposite. You get the wild swings when new stuff is released, like a stone in a lake. But after a while things settle out and we get a better sense of how cards and ships interact with plenty of space for people to introduce new ideas and tactics with a trickle up effect. Stuff that proves to be effectively out of the box, makes its way into the box, and the box changes shape. This is good.
FLGSs will always have a larger box than regionals, and regionals will be larger the nationals, etc.
I agree with your assessment of how this plays out. I might also have some sympathy for your conservative approach, but I'm not sure this is what we're going to see. It seems like FFG is happy to pump out new stuff on what seems like an accelerated schedule. No sooner will the Phantom shock come to some form of equilibrium as we will see the introduction of Rebel Aces and Wave 5.