There is no question. Platforms and experts all agree that creative has the largest impact on campaign performance. Improving creative has a direct impact on your results. Any increase in creative performance creates a proportionate increase in your results. Creative is one of the few metrics that can alone have a 10x improvement.
Creative is more important now than ever. With new privacy and anti-tracking updates being released by platforms, targeting specific personas is becoming increasingly difficult or otherwise gone. Creative is now a primary way to reach those personas within broader audiences. With strategic creatives, you can get the algorithm to find the right personas even when there is very limited targeting.