I’m an artist, and I just checked my 67 color pencils. Not one of them had an eraser. I have a Pink Pearl, an artgum and a kneaded eraser, but none of them are connected to a pencil. However, I am not an architect, so I cannot speak to that profession’s need for a connected eraser.

James, in the parts section at the top you can purchase the adhesive strips that are a custom fit ([linked product missing or disabled: IF173-005]). I just replaced the hard drive and these strips are quite easy to work with. It's just a pain that you have to replace the adhesive anytime you need to go inside. Apple is getting lazy.