My last employer didn't understand this. Currently they have to deal with at least 5 different CMS, 4 shopping systems, and some hand made sites with at least

My last employer didn't understand this. Currently they have to deal with at least 5 different CMS, 4 shopping systems, and some hand made sites with at least 4 different frameworks. 2 backend languages. And legacy code with self written frameworks in PHP 4 on at least 2 important sites.