Over at WPEngine we're finding a lot of people are using us to host their Saas/Web App landing/sales/info site in WordPress and then run their app at app.domain

Over at WPEngine we're finding a lot of people are using us to host their Saas/Web App landing/sales/info site in WordPress and then run their app at app.domain.com via AWS, Heroku, etc. Wordpress allows you to decouple the "info site" stack from the web app stack, which are not necessarily the same technologies - and so this can go way beyond just MVP.