It was discussed in the article. They're adding a vibration and audible warning once the motor reaches its limit, or in any other edge case where the board cannot supply the proper counterbalance.

Why this feature wasn't implemented after the first prototype ever made is completely beyond me. Seems like a literal no brainer. The "bump" feedback can easily be mistaken for an uneven road surface (ask me and my broken ass wrist how I know) but a board buzzing and audibly yelling at you is hard to mistake.