One of our subcompanies plans to upgrade to Magento 2 Commerce. Their agency claims they have to reprogramm our theme to make it based of of the Luma theme, otherwise it won't work with enterprise/commerce, as they claim. They ask for a couple of hundred thousand € to upgrade to commerce.
In my eyes this is totally bs and makes no sense. I upgraded our test site of another shop where the theme is based on luma, and I did not had to change anything in the theme or extensions, it just worked out of the box. I also switched to magento/base and the enterprise features were still present. Why should it only work with luma?