I would also agree with @bkonia concerning WordPress, but I think @Jo 's last point was meaning updating the integration inside BootStrap Studio not the deployed sites. Setup, API changes, compatibility, etc., as things advance or change. Which may or may not be an issue, at least that's how I understood her statement.
Regarding CMS, I don't know the demographic (does anyone?) of deployed Bootstrap Studio sites and what type of sites are mainly built using the software?
Obviously Wordpress is the top of the heap, but I could imagine even Flat File CMS solutions being relevant to many users. Ones such as OctoberCMS, RespondCMS, GravCMS, CouchCMS, etc. If one or a few were built in via the BSS interface/GUI for setting up the CMS elements, it would offer BSS users a way to deploy CMS enabled sites themselves fairly easily with not much more work than deploying a non CMS site.