There are heaps of SaaS platforms out there (from my last point of reference there were 2000+ MarTech companies, I would guess double that now) that focuses on; A/B testing, email marketing automation, customer success tools, heat mapping and much more. They have funders who want their returns, one way or another. Which then leads the marketing team of the SaaS to develop growth hacking articles which startups tend to absorb.
As a marketer you are backed into a corner of having to test everything because there are so many articles out there showing us how A/B testing a button from 17px to 18px increased sales by 50%. Or this genius new AI content tool that can swap things around for each and every user to match up with their purchase intent. It's gambling. There is data and some poor calculations that lead you astray hoping for that quick win. You will also find that one 'unicorn' SaaS will also dictate the UI/UX for the vast majority of others out there, look at Intercom which basically has been cloned in design across the board.