Haven’t been around much, but this type of thing strikes close to home for me.
Not true. In 2D, you are watching images on a screen. No doubt about in your mind whatsoever. In properly produced 3D, almost no imagery appears to be on the screen plane. The only time you’d be aware of the screen is if it has some physical imperfection or projection issue that ruins the illusion. So yes your logical brain knows there’s a screen, but you shouldn’t really “see” the screen.
A good example is Forbidden Journey in 3D (RIP). The domes don’t look like domes at all. It’s a very different feel. As good as they look now (just saw them a few weeks ago for the first time, and I am impressed with the new projectors), it’s clearly a dome and a fisheye lens.
Also not true. The problem is they built too many screen-reliant attractions. The solution is to stop doing so, not gut existing ones. Replace them maybe, but not just make them less.
And if it’s some sort of cost-saving thing.... then ugh.