Hi! Great question. I love static websites, but we hit a point where we were updating the site constantly and needed dynamic content, like the running costs (which pulls its data from a google spreadsheet). There are certainly ways to do this with a static site, but with the size of the site and frequency that we update it, I really wanted to be able to hit save and it was live, rather than wait for everything to compile and publish. I still use Siteleaf for all of my other websites, but cushionapp.com is a different beast.
Also, lol at "marketing team". I am marketing team. :)