Why do you need Bootstrap? You can write a grid system in less than 10 lines of code with Sass. You can also do a typographic mixin in 5 lines of code then customise it as you need. You can also have a icon web font set only for tag in 5 lines of code. What else is there? Forms. You can reset the forms in another 5 lines of code then add stuff for [type=submit] and so on. Why do you need thousands of lines of code wh…
The idea that using Bootstrap cost me time is objectively wrong, as is that of it costing me money. Currently, my minified CSS and javascript from bootstrap is not affecting the page load time in any significant way. For me, using Bootstrap for MVPs has proved supremely useful, time and time again. I would not be as bold as you and claim my experience is applicable to everyone, but it is obviously very beneficial for me.
Something not often considered by the haters is that most of the time, the customers that the MVP is directed at have no clue about Bootstrap. Unless I'm building something for developers, it's usually not something they have seen before. I've actually gotten many compliments on design, when it was largely just Bootstrap's CSS.
Further, putting some structure in for SASS typography isn't the same as creating good typography. I've found it extremely difficult to create readable, custom typography in the past and I'm quite sure I am not alone.
Your "framework" gives me some kind of grid system, some structure that I can go out and create my own typography system inside of and some kind of functionality to "reset" forms. And then I can add "stuff for [type=submit]". GREAT.
Things I used from Bootstrap 3 in my MVP created in one night:
1. Responsive grid system. 2. Typography 3. Colors 4. Notifications 5. Forms 6. Buttons 7. Modals 8. Panels 9. Wells 10. Image helper classes 11. Navigation Bar 12. Pagination 13. Popovers 14. Media Objects
Your idea for replacing Bootstrap falls so short of the mark it is laughable.