I also find it faster when a coworker requests I shift an image down, to add style="position:relative;top:10px;" to adjust an image or div down a few pixels, than to find the style sheet (one of dozens nestled in various locations) and add it where it belongs.
See, although I can understand that impulse, if I'm working with anything that I'm ever going to look at again, inline styling is something that I won't do. If it works for you do, it but I hate messing with it :D
I just found it faster to add the classes directly to the HTML.
But I will check how this would work with Babel+WebPack+React in the future.
I can import SASS files in JS, but they would have to be merged with the Bootstrap SASS etc.