It is the same with golf. Every year they tout the newest irons as the most forgiving and that they help increase spin around the greens. Same with the driver. Every new driver is apparently 10 yards longer than the previous. Yet former players like Nicklaus are saying it is the golf ball that needs to be changed to reel back in the distance.
Regarding bowling; most of us have figured out the industry can be very mix and match. An example is Storm and R2S. How many different balls have had that cover on it and when was that cover first introduced? Seems like only once every few years does a company introduce a new cover and/or core. Even then, 2.55 RG is still 2.55 RG no matter what the core looks like. The biggest difference now regarding cores in intermediate differential or torque. You can have a 2.55 RG on two different cores. However, the difference in .010 and .020 is pretty significant.