That link about upgrading between Flexform themes is very interesting! I have tested upgrading from Flexform to non-Swiftideas themes and it makes my site a half broken mess that needs several hours of configuring the new theme to fix.
After doing the process in that link with an export and import of theme options how different would a site look on the front end? How much stuff would break and how much work would be needed configuring the new theme? I am thinking of menu and widths and fonts etcetera
If Swiftideas releases a new multipurpose theme on bootstrap 4 with fluide/variable full width and a well functioning upgrade process from Flexform this year I will buy it for sure 🙂