The idea is simple: Allow Display Blocks in slab form. So we can have modern thin 1/4-thickness LCD displays everywhere instead of ancient giant late 90's-era CRTs taking up all our interior space.
Yeah, we need to slab all of the things.I've only had issues with this on smaller, more compact designs. I like to label doors to assist with navigation, but sometimes there isn't room for a full display block. A slab would get the job done and still leave enough room for someone to walk by. A good example is narrow 2-block wide hallways where all the attached rooms only have 1-block thick walls. There's no good way to fit a full display block in the walls and have it look good, especially from the back.