I'm a professional PHP, Python and Javascript developer from the UK. I've worked with Django, Laravel, and React, among others. I also maintain a legacy Zend 1 application.
You don't need to, but it's hard to justify spending much time building and styling an admin interface that will only ever be seen by a handful of administrators, especially when you're doing client work. Bootstrap provides a workable set of components suitable for this use case.
In an agency environment it's very hard to justify spending more time than you need to on an admin interface when the cost has already been agreed and deadlines often slip.
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I have designed many admin interfaces using custom code, Why do you need to use bootstrap?
You don't need to, but it's hard to justify spending much time building and styling an admin interface that will only ever be seen by a handful of administrators, especially when you're doing client work. Bootstrap provides a workable set of components suitable for this use case.
In an agency environment it's very hard to justify spending more time than you need to on an admin interface when the cost has already been agreed and deadlines often slip.