I work at Webs and we also recently abandoned scrum for a more kanban approach. While all points in the article resonated with our company, the biggest problem we had was not delivering projects on time.

We focused too much on fitting as much work into a sprint as possible for maximized throughput. The problem with that, especially when you have alot of projects going on at the same time, is that alot of work was being burned across the board, but the needle for each individual projects didn't move forward fast enough and we ended up missing deadlines.

Another problem with scrum is that it turns creative developers into code monkeys, and this in turn lowers code quality. Developers are constantly worried about trying to meet deadlines for the next two weeks rather than taking the time to do things correctly. This ultimately creates technical debts and hurts the team in the end.

(also, if you're a manager and you use the developer points burned in order to rate performance and distribute bonus, then fuck you)