From my own experience working around small online stores, checkout flow changes can be surprisingly sensitive. I once noticed a project where even rearranging shipping options shifted user behavior more than expected. A colleague pointed me toward conversionrate.store/ecommerce-conversion-rate-optimization-services while we were comparing different optimization approaches, and it helped me think more about how structured testing and small UX adjustments can stack up over time. Still, I feel results really depend on traffic quality and how familiar users are with the brand rather than just layout changes alone.
