I wouldn't agree with this:
Only if you think that unions are always acting as a brake on an insurrectionary working class
And just think this is, respectfully, rote marxism, that is generally limited, but in many instances not off base:
bargaining over the price of labor-power.
The rest of the critique I generally agree with on the level of a critique.



Can comment on articles and discussions
Only if you think that unions are always acting as a brake on an insurrectionary working class. In my experience, that's usually not the case. Quite the opposite. A lot of union functionaries tend to be leftist idealists, generally trying to mobilize a passive and apolitical membership.
Honestly, I think too many people read these critiques of unions written in exceptional situations like 1918, where they do act as such a brake, or Italy in the 1960s and 1970s, and take an essentially correct understanding of the unions as immanent to capitalist logic, but try to extrapolate that in unenlightening ways. In situations of general passivity and immobility of the class, unions aren't really holding anything back. They're performing their normal function of bargaining over the price of labor-power.