Let's get that straight: Your argument that the USSR didn't have a ruling class was that Khruschev didn't make all the decisions. Capitalism has a ruling class (the owning class) but they don't make the decisions either. It's the market that does in capitalism. Sounds like capitalism doesn't have a ruling class by the criteria you introduced. On the other hand, the USSR had a committee of elitist experts and the union bureaucracy. Which to me sounds more like a ruling class. Maybe try to use some consistency.

My argument – following Simone Weil – is that both liberal capitalist states and bolshevik states are at their core bureaucracy as in the bureaucracy is the ruling class. In liberal democracies, there are 3 bureaucracy: the state bureaucracy, the industrial bureaucracy (think (middle) management) and the worker bureaucracy (unions). All of them are detached from those they are supposed to represent. Bolshevik states, as self proclaimed worker states, unite all these into one, which doesn't change alot. The problem is the vertical power structure within unions and parties and stuff. That's something, I am as convinced as before, most Marxists have no analysis of. I will not repeat the Bakunin quote but I think he nailed it (even tho he wasn't a perfect person over all).

I’d have to read that book

Here you are.

the failure of anarchists of arming the working class

Well, it's not that easy to arm the working class without weapons. Guess who had weapons and decided to side with the republicans instead of supporting the revolutionary socialists? Why no mention to the relationship between the USSR and CNT in your response?