Maybe I misheard the presentation, but there was a pretty significant bump on the iPhone chip...and even the watch chip was improved...one component, the CPU stayed the same, but the rest was updated...similar to S4>S5, same CPU but added gyroscope and some other features...it does get incremental at some point.
from the front page Macrumors article... The iPhone 13 Pro, or iPhone14,2, earned a Metal score of 14216, a 55 percent increase compared to the
9123 Metal score earned by the iPhone 12 Pro.