Unions came about because of wages, safety, etc. Now all of that is covered by various government rules/agencies that actually enforce the laws. The only area I still see the need for a Union is Police and Fire unions. We have seen numerous cases of Dem mayors, councils, etc. throw officers and depts. under the bus when something happens that is justified but upsets SJWs.
Unions have a place - as counters to monopolistic practices by business when they exist.
That said, they are fundamentally a monopolistic practice. ...Which is bad.
If businesses have no ability to enforce monopolistic practices, there is very little to no call for unions.