Why doesn’t Webflow allow a custom domain and cms support for the $14 a month plan? It doesn’t make sense why the starter free plan offers cms support and the next plan up offers no cms support, but does allow a custom domain. What makes sense is that each plan has features of the lower plans before it.
I think the idea is that you use the free plan as long as the site is in development (free plan does not include custom domain).
As soon as you want to launch a site, you pay the plan that fits your project.
Now if you want to create a site with CMS functionality, its good to have the cms feature embedded in the free plan. Otherwise you would have to buy a cms-site-plan instantly as soon as you start the development.