The day you pick up a nice camera, use it extensively with success, then by accident discover it is mirrorless ... maybe it will happen, maybe not.
Lest anyone should consider me a stout enemy of the mirrorless principle, I hasten to add I also own around ten different ones at present (Sony, Panasonic, Fuji, Nikon). However, none of them is anywhere near fulfilling the "Turing's test for photography" outlined in the opening paragraph. So I won't hold my breath - yet. My mirrorless cameras have given me some options, most of them not new to the scene, but solved differently.
Besides the obvious points of needing much better finders and general handling, there is also the question of lenses. Using third-party lenses via an adapter is of course fun and make playing with gadgets or exotic optics entertaining, but in most cases one is robbed of all the automation progress made since the '50s with no evident reward in sight. Native lenses with good handling properties are required.