It's great that the Bootswatch guy is narrating his work in converting from Bootstrap 2.
1. Easier to customize -- I can't comment since I don't customize Bootstrap, but I benefit from others doing so. Such as Bootswatch. So if he says it's cool, I'll go with that.
2. Smaller file sizes -- not a big issue for me. I think the files were already pretty small.
3. Mobile first -- much more powerful grid system. Ooops. I had just barely begun to understand the old grid system. "Much more powerful" usually means much more complicated. And to think of all the places we've deployed the old grid system without factoring.
4. New components -- a good thing of course.
5. They switched from camelCase to hyphens -- A style war. The people who wanted change won? Make-work for the rest of us. Ugh.
6. Easy to transition -- remains to be seen. Based on what it sounds like, and from my own early experiments, it seems it'll be a while before Fargo and its sites transition from Bootstrap 2 to 3. It seems at some point it'll be inevitable. I much prefer to add new features to my software, or maybe take a bike ride, or perish the thought -- write docs.
One more thing, I wish there were a rule that you had to put your name on your blog so that people who wanted to respond, such as myself, didn't have to say "The Bootswatch Guy" or "he" (assuming it's a he, when it might not be). It's looks like he's Thomas Park. If so, thanks for the great work! I love the templates and the site.
BTW, my name is Dave.
Update: Thomas Park is indeed the Bootswatch guy.