I realized that one can use Scaler interactively, as an ideation or composition tool. But also as a learning tool, which has been my main use case - to learn about harmonies, progressions, melodies etc.
Now I am starting to do the things on my own that I learned from Scaler. It feels like taking off the training wheels in the process of learning to ride a bicycle.
I am sure there’s lots to improve on this track, paticularly more song structure (less monotony). But I am proud of the chord progressions that I have put together from memory, not looking them up. Only later, when I was done with the tune, I sent it through Scaler to see what the chords were called (and it matched with what I assumed when I experimented by ear in the DAW piano roll).