It's a usability issue regardless. It's unexpected behavior, and these "little things" as you put it, pile up, and I can't get behind a decision to "visit usability at a latter time." The core features are great, it's the little things that make this application NOT worth leaving Illustrator. Sure, you have to "unlearn" a bunch of stuff, but there should be some semblance of intuitive interactions. Micro interactions are a key component of a users workflow, especially in design, where repeated interruptions become a key consideration when contemplating abandoning a tool.
This bug, coupled with the lack of ESC/Dismiss modal quick-key is a frustrating recipe.
TL;DR - You shouldn't have to unlearn anything to get on-boarded.