For me the dark user interface of bootsratp studio with the hard contrast between black Background and Text Color is very tiring and also more confusing. But I know, of course, that there are very different views. Nevertheless, I would be thrilled if I had a bright interface to choose from.
Interesting article to this feature request: https://www.quora.com/Usability-Are-there-any-studies-regarding-readability-of-inverted-light-on-dark-schemes-in-software-design