I ran into the language very differently than many posts here. The Tidbyt [0], a retro-style smart display designed to provide at-a-glance information on the weather, sports scores, transit schedules, etc., uses it to enable people to create their own custom displays.
For those purposes, it is simple. The simplicity reminds me of Lua. It is a perfect choice for the device.
I have the opposite perception from you; I tried to create apps for Tidbyt, only to run into obscure differences between Starlark and Python, inability to parse data from API endpoint, inability to debug. I followed your link and saw that the platform somewhat matured so I'll give it one more try