Self-management is a fad.
You are better off developing self-management skills yourself than spending money on self-proclaimed experts.
Self-management can't be useful for relationships.
Business must not prioritize investing money into employees training to maximize productivity.
Self-management is only for a privileged few, but not for those for whom a job is a matter of basic survival.
Some people, especially those carrying post-soviet mentality, find it hard to adapt to a self-management model. They are more accustomed to being told what to do.