Millenials are unknowingly signing up for slavery and throwing away all the hard earned labour rights in the name of being more agile.
As an employee I can walk away from my job any time I want and just get another. If I had my own business that would be way harder.
Because of that I feel actually more free and independent as an employee. You just need to make sure to have a good financial buffer so that losing/switching a job won't hurt very much. Then your employer also can't pressure you too much.
You're 100% right about having a buffer, though. That's a pretty immovable prerequisite no matter what your professional situation is.