You can't expect anything from version numbers used for marketing purposes anyway, in fact it was also frequent for such products to have internal version numbe

You can't expect anything from version numbers used for marketing purposes anyway, in fact it was also frequent for such products to have internal version numbers that are much more consistent (e.g. Windows). You can do the exact same thing with the semantic versioning---you don't have to increment by exactly one. That practice is irrelevant here.