For a while, Yup.
This Is Not Bootstrap, and my skill set with this theme is looking up but I'm still learning the classes. A great deal of the point of learning Bootstrap was so I could write Less CSS since Bootstrap comes with everything including the kitchen sink, for my purposes anyway. There is a particular unhappiness with a lack of Sub-Theming as well, which would make life easier.
[Yes, there are Bootstrap themes for Backdrop but they only pull out of the CDN and again, don't do sub-themes...but I may have to suck it up so I can wrap classes around blocks giving me a hell of a lot more layout flexibility. Or just port the Drupal 7 Bootstrap 3 module, which I think is beyond my current abilities.]
This is less Web Development and more The Humpty Dance.