A lifesaver thread! 
I’ve been trying to find out why Shizuku didn’t work for a couple of days now (while executing from app shortcut in AppSupport).
Can someone give a simple explanation to a semi-n00b user as to why Shizuku is required to be executed via script from sfos terminal with su rights, and not by directly executing the app via AppSupport like any android app (just like any other un-rooted android device)?
1000 thanks in advance!