Bonus nonsense:
Glittering Images by Camille Paglia
I stopped reading after this horrendous introduction. I would describe the prose as Redditor adjacent. The author identifies as a civil rights era liberal and atheist, while condemning black art and Piss Christ. There were some pretty pictures in the book tho. I don't know who this author lady is/was but she sucks. 2/10
E: if you look this lady up, as many in the comments have done already, turns out she's a racist, transphobic pedophile. classic anticommunist
that's usual materialism. dialectical materialism operates on society development level, and individual as an atom of that society. laws customs rituals appear out of development of material forces of production and exchange, the mind typical materialists accept quite readily, not for nothing they were imagining it as a series of gears or whatever. the materialists may think (and quite often do) that all that society structure is purely mind exercise, the gheist of the people or institutions or whatever, thus marxists call them idealists.
you may think quite easily disconnected from material reality (say, writing fantasy book), but you may not act in discordance with reality or, by extension, society (thus if you are reborn in slave holding society, unless you have readily made cavalry and cannons and good ideas about crops and crops themselves you are unlikely to progress anywhere from that)
That's a rather depressing way to look at it. If I was Isekai'd I'd still have all my accumulated knowledge. I could at least try to organize something.
The way I see it Idealists is rather simple, they lack just one thing: Direct experience. It's more or less what you've said, if I understand it correctly. I do find experience rather interesting, when I was a child I used to disconnect form my body quite a lot during stressful events or hunger, sometimes another voice would take over, sometimes I'd take a puppet and use that to serve as a vessel for the other voice, it'd be helpful to discuss things over, but over time as I grew older and accumulated more knowledge I had no more need for my childish ways and now it's just me experiencing the world as one. You think I'm the scared child or the puppet that took over? Perhaps neither.