Couldn't we shift our sense of things and experience entities in the external world to be "phenomenal" objects in the external world? Would you think some philosophers already do?
I think you would if you grew up in a culture where experience is "only" phenomenal and not "real, direct reality" and there may well be or have been such cultures - the language would support this. And the very idea of a "real, direct reality" is the one our culture embraces now
Then I would say for someone all of those are compatible with experiencing "phenemonal reality" in the same way you say that you currently experience" reality".
As I initially answered, no, imo, I don't think there are philosophers whose experience feels like a simulation. There may be philosophers who have believed so fiercly and for such a length of time that their experience is not reality but instead a virtual, phenomenal reality that this thought is always present as they reflect on their experience, but I still do not think their experience would feel like a simulation.
However, I do think some individuals with neurologic disorders may have experience/consciousness that feels as if its a dream, hallucination, or simulation. We've talked about a disorder here in this thread in the past where people feel as if they have no free will or feel as if they are not a self.
There are times when experience may feel like a hallucination or simulation to neurotypical individuals as well, of course. The experience of deja vu always knocks me for a loop when I experience it from time to time.
And as you say, yes, I can conceive of a culture in which the members beliefe that their experience is a phenomenal simulation of a separate, distinct reality of which they cannot distinctly access, however I would argue that their experience
still would not feel like it was a simulation. So, they may have a cultural belief that their experience was a simulation, but it wouldnt feel different from our experience.
Speaking of, I wanted to expand on the notion that this very view might indeed take root with the mainstreaming of VR.
That's a fairly tame video, but as the technology continues to progress, one can see how people will begin to find Lehar's shocking assertion less shocking. That is, as VRs become more detailed and life-like, people will begin to think that if VRs can exist in a pair of goggles, maybe our phenomenal reality can exist in the (vastly more powerful) brain.
In the paper I linked above by Langitz, he writes about false awakenings. These are dreams in which people experience waking up, only to find that after some time, they are in fact still dreaming. When they do finally wake up, they are at first uncertain if they are truly "awake." These experiences are understandibly powerful. While ive never had one, I have had terrifying dreams that I thought were real. Where ive thought my life was ruined. When i wake from those dreams, i have felt immense relief that they were dreams!
As more and more people use increasingly realistic vrs for extended lengths of time, months and years, I expect people to experience vr false awakenings. Situations in which people arent sure—even if momentarily—they are experiencing "reality" (normal experience) or virtual reality. I do think people will begin to wonder if normal experience is a virtual reality. The research, neurological evidence, and philosophical arguments will be there waiting for them.