I had a client who wished to view their QS theme in bright colors during the day but also wished to turn on 'Dark mode'. So I created 2 apps with two different themes.
That made me realize - why not bring in the option for users to pick between themes the developer created (optional). That would mean simply allow the name of the theme to be a variable and voila!
Let's give this one some shout out! Shouldn't be difficult to achieve and the outcome would be stunner.