No, new balls are not the best every time, but then neither are old balls.
If Brunswick only made the Danger Zone and Hammer only made the Black Hammer, how long would they remain in business?
There are great balls made that few people buy so the company has to stop making them and try to make a new one that people will buy. It's not how good the ball is or how pretty it is, it's how many people buy them that is the only reason to continue making any ball.
Bowlings balls are an evolutionary product. Revolutions, like the resin coverstock, are few and FAR between. Even asymmetric/mass bias cores took a long time to become a standard product. Brunswick once made a video to explain how there could not be and there was not any difference added to a bowling ball's reaction by an asymmetric core, yet they made the first, the Phantom and they are now "on the bandwagon". SO asymmetric cores were strictly an evolutionary modification.
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"None are so blind as those who will not see." Unofficial Ballreviews.com FAQ