As a Triathlete, I used to say “The swim is what I use to find where I parked my bike”. However (many years later) having started swimsmooth with a plan to do a 10km swim (Just because it as if that is what a proper swimmer would have done), I completely changed my stroke and became quite a different and more effective swimmer.
Even looking at their videos on technique, because they explain why each technique helps and how it helps.