I have never worked for a company where the PM was an honest to goodness subject matter expert. There have been PMs who learned a lot about the domain, the same

I have never worked for a company where the PM was an honest to goodness subject matter expert. There have been PMs who learned a lot about the domain, the same way good experienced software devs do. But the majority of the time it feels like we just stuck a middleman in between engineering and the real subject matter experts.