I think it's not size per se. It's not as though Kanter is beating them up; he played 8.5 minutes in game 4. It's just that Westbrook is outplaying Curry and Adams is outplaying Draymond.
Yes, I also would not see this as a 'defeat' for small ball in general.
I do not think jumping to conclusions after a playoff series (which incidentally, is
not over yet) does not help much in understanding which direction NBA is going to.
Even if they get eliminated in game 5 today, what GSW achieved so far is impressive; investing so much energy in breaking the Bulls record might have been a mistake (I was wondering why Kerr was not resting players in the last month tbh), but on the other hand, the allure of the record must have been irresistible.
This GSW team will be remembered for a long time.