Hoping you can elaborate on why you’re saying this. S22 starts CMU SCS in the fall and although he’s not planning on BXA, we did not get that impression at all. They seemed quite supportive of BXA students.
That’s not entirely accurate. The Gates building is located in the center of the campus. It was built on a large gully with the intention of connecting the two areas of campus separated by that gully. It’s true that from one side you get there either by walking across a really interesting foot bridge lined with metal sculpture walls to enter on an upper level or by descending a set of steps to enter at the ground level. Yes, there is some fencing in the gully but it’s to keep people from falling. Some pictures here: https://www.arup.com/projects/cmu-gates-and-hillman-centers
To the OP: visit the places that interest you, if you can, and and see what’s right for you. I think most people here want to help, but remember that no one’s opinion is as important as your own.