The fundamental assumptions behind Agile are as valid as they were 25 years ago. The problem(s) are control freak managers who are incapable of coaching their teams into taking charge at the local level, devs "who just want to code" and not think for themselves about the larger context of the work, and bullshit "life coaches" using Agile coaching as a way to "break into tech" with no tech skills.
This is fundamentally a crisis of incompetence, where people are failing to implement what at its roots is a better way of working, in certain contexts anyway, because they fear giving power and control to the rank and file.