GUS MUELLER, THE SHAPE OF EVERYTHING:
We fixed hundreds of minor bugs and annoyances. Little things that built up over the years that very few people ever encountered, like "the shortcut key for zooming in doesn't work when the keyboard layout is set to Dvorak - Qwerty ⌘". So we fixed pretty much all of those. It took months and months of work, it was super boring and mind numbing and it was really hard to justify, and it made Acorn 5 super late. But we did it anyway, because something in us felt that software quality has been going downhill in general, and we sure as heck weren't going to let that happen to Acorn. So we took a long break from adding features and just fixed stuff.
Clearly, this is what's called "craftsmanship." And for that, I'm getting Acorn 5. You should get it too. Here.