Serious question: if the business just needs a static site, why are they paying tons of money for bespoke software engineering? Just use one of the millions of good-enough and free site builders out there.
But, yes, I've seen countless businesses for which something like Wix is perfect.
1. Site builders are still hard to use for most marketing staff, if the site should look professional and you need a few small integrations.
2. They don't mind paying for a solution where someone else does the work.
I guess it's hard for marketing departments to pick an appropriate agency and to know the consequences of the technical choices the agency makes. They generally evaluate based on design and then have a few requirements like: resonable performance and support for a handful of features in the backlog.