To me they're like mere servants of the State, like Lenin talked about in "2. What is to Replace the Smashed State Machine?" in his writing "The State and Revolution"
Under Capitalism, they are its privileged knights that try to deflect and control, if not defend directly its image as "the only option", who have their incentive in doing so, with their class status stake being in their duty to shepherd the means of production and its resulting benefits
However, they don't own the means of production, as they merely manage it for the landholding, industrialist, and financier capitalists
On the other hand, under Socialism, while its privileges will be probably be done away, the PM class on its own would innovated upon, for their new duty of overseeing, managing, and reporting the collectivized cooperatives and state-owned enterprises..
Until the final stage of Communism arrives, I think they're pretty handy
I say this, because I hear such disgusted sentiment in Hexbear against them
Funnily enough the two most proactively agitative people outside of my politically active close friends have been two of my current and previous direct managers
Both are libs with some socdem tendencies, but they also are smart people working as the interface between money and labor. It's hard not to develop at least some kind of class consciousness when you are the person telling people that someone else fired them
Granted, their criticisms are often pretty surface level, but honestly the last time I talked with my current manager face to face it felt like they were inches away from calling for a strike (we are firing 80+ people at our location because the line went up slightly less than last year)
My old manager thaught me how to take advantage of the corporation and the bureaucracy for my and the customer's benefit, and didn't hesitate to explain in detail the many ways the company and the government was fucking up and fucking people over
PMC's are labor aristocracy with usually at least some passive capital from shares or investments, but especially with raises being tied to managerial positions at certain levels depending on the industry (and let's be honest, it's always better to be managed by someone with actual experience), I wouldn't determine class positions from the hierarchy of the system