user-generated content – Block editors like the one from Medium.com

Based on my own tests, I really liked, so I plan to implement this type of publisher on a new website (that is, the old guard did not exist). However, part of me says that this is the typical type of impulsive decision that can end up frustrating users due to an unexpected flaw in the new user interface.

So, with that in mind, does anyone have any experience of the disadvantages of block publishers like that of Medium.com?