I think maybe my point wasn't clear enough, I agree with you. I was trying to point out that with experience you know where to start testing so you can focus on

I think maybe my point wasn't clear enough, I agree with you. I was trying to point out that with experience you know where to start testing so you can focus on fixing the pain points that will have the biggest impact. A/B testing is an important tool to aid optimization, but knowing where to focus your efforts is key. I have over a decade's worth of experience improving e-commerce conversion so generally my first step isn't introducing testing, but fixing the obvious things I know will have an impact because they always have an impact, e.g. fixing a confusing checkout; improving search and navigation; embarking on a data cleanup and improving product content, etc..