That's actually the basis for Mahayana, which then transformed into multiple kinds of Buddhism. I'd consider it a pretty spiritual stance, if not only because it means that you've spent time thinking about what is "reality" and our role within it.

Not at all to imply that this is your case, but there's a difference between having an intellectual understanding of idealism and actually having the lived experience of it.

And most people need to do some kind of practices to get there, which are typically found in spiritual contexts (meditation etc.). But there definitely are people who just kinda drop into it.

Though... yes. It's a philosophical stance but it kinda gets tossed under the umbrella of spirituality. Maybe that's actually a problem come to think of it. Since spirituality is easier to dismiss as "woo" (as in, everything that goes against the almighty scientism is woo...)

Though you do say:

subjective perception

What do you mean? Because as an idealist, I was specifically taught to see the difference between a subjective perception and general consciousness. It's very possible this is just semantics of course.

Cool, do you think the belief in physical reality can be harmful?