Your argument until this point was believable enough, until you took a postmodern turn revealing what you truly are... a Modernist! ( A Marxist Modernist at that!)

Modernism is a form of 'objective idealism' where the objective world is mapped and modeled, but never directly experienced. Thus there is no realism; no way to get at reality directly. Just a system of objects. Postmodernist then takes Modernism to its logical conclusion saying reality is socially constructed. Both are idealism.

Marxism is an even worse form of Modernism. They believe they study 'concrete' phenomena from which they abstract general theories. They think they are being scientific, when they are just idealists.

Mysticism though, believes in 'reality'. There is something outside ourselves and outside the human mind that is real. Kant called this 'noumenon'; the thing in itself. Mysticism is against idealism in all its forms including Modern 'objective idealism'.

The ability to be able to think there is something outside ourselves, and want to know what it is, is a foundation for a healthy mind. To be a mystic, is to have a healthy mind that struggles with reality. Modernism causes alienation from the real, and eventually causes mental illness. Marx uses the term 'alienation'. Alienation is the normal condition of the Modern and Postmodern mind because it is in a constant state of idealism. Mysticism, for all its flaws, seeks to experience reality directly.