I don't understand the SmartThings/SmartApps ecosystem -- thoughts and feedback after several weeks

Totally agree. I’ve also brought this up some time ago. ST “Modes” are not even close to “scenes”. They’re just global state variables. The “Hello Home” actions are more or less equivalent to the scenes, but even then only superficially. Why ST decided to deviate from the traditional “HA Scene” concept is beyond me.