Earlier quoted context omitted.
Could you provide some concrete examples? I see you work at a marketing agency in SF. That probably means you could have some good ones to share. Like a/b comparisons of pages that saw such improvements. Not sarcasm or passive agreesivesness. I'm genuinely interested in the data from someone in an agency.
No aggression perceived. The best client example is Groove ( https://www.groovehq.com/ ). In 2014 they hired us to take the existing site ( https://web.archive.org/web/20141223145657/https://www.groov... ) and make it attractive to serious customers who can "trust" their company based on the site. Went from 1M ARR to 5M in 18 months. A more concrete personal example is when we ranked "HTML Color Codes" with essential…
I think your examples do not really prove the role of visual design conclusively because in the 18 month time-frame, the folks at Groove must have had several efforts running concurrently with the explicit goal of increasing revenue. The web site facelift you were engaged for happened to be one of the steps they took towards that goal.
For instance, they would have intensified sales, marketing, customer success, fixed bugs in the product etc in addition to the revamped website, so we can't really pin the significant jump in revenue from $1m to $5m on visual refresh alone.
Not trying to diminsh the work that you did, merely trying to put things in perspective because our tendencies as humans is to misattribute causation, which is bound to happen if all contributing factors to a thing's success are not properly considered.