We have to think about what to do, when we commit breaking changes in our Template or CSS system.
@EdwardBock mentioned the WooCommerce way:
- No legacy support setting.
- Better: Grid could check the number of template files in the theme folder and suggest to copy the remaining old template files into the theme to maintain backwards compatibility.
- Version numbers in the template files?
- No legacy fallback support inside the templates, the templates should stay clean.