Why do this when you can simply disable the desktop?
Because you are downloading the crappy bloatware you don't want.
I appreciate that Scout31 is trying to be more subtle and considerate of how he handles Blockland Glass, since the direction has taken a sudden turn now its absorbed a desktop mod that was (in my view) pretty shabby.
You are coming from the BlockOS topic. The rest of us wanted Glass for simpler purposes, and I for one intentionally avoided BlockOS.