A very specific thought on this:
I love the fact that there are no settings because of one advantage it offers (it has disadvantages too, like any trade-off).
Namely, that you can always be sure of what settings you've changed. The answer will always be none, since there are no settings.
Removing settings altogether is not the only way to achieve that; for example see how Sublime Text does its settings, you have a very easy to read explicit list of all settings you've changed. So resetting to default or undoing a bad chance is as easy as removing unwanted entries from that Preferences.sublime-settings file.
Having less choices is nice for when you don't want to change anything, since you know your settings are optimal defaults and you don't need to spend time on making sure that they are. If you use 100 apps and each offers 100 choices, that's 10000 settings to ensure are optimal. If you don't, they likely won't be.
99% of software pushes towards more choices, more settings, more customizability, which adds to cognitive overhead of using said software if you care about having optimal settings, so I'm glad to see an experiment that boldly pushes in the opposite direction.