Haha... "...it’s time for piano teachers and piano examination boards to start looking at the kinds of new cadences that express the meanings of the 21st century..."
I think they've done that already. Been there. Come back. Gone back and returned again.
I wouldn't take that blog post very seriously. The dominant chord just usually leads back to a tonic chord or sometimes to a vi chord of some kind. If you don't get to the dominant chord, you can move around, stretch it out, but once you get to the dominant hcord it's going to sound like to wants to resolve. Although I think the blogger was talking about pop music.
There are a lot of basic theory/harmony books on here. Just search around.
The chords used and notes of the scale force our minds to hear things relating to one tonal center. If you play a major scale, it might start sounding like that key -- Play a C major scale, C starts sounding like the center. F has Bb, so if you play Bb instead of B natural, it can start sounding like F is the center. If you're hearing things in a major key -- You could hear them as a minor or d minor. The chords will really hammer it in though. If you play a C dominant seventh -- C E G Bb -- it will sound like it wants to resolve to F, and it will sound like F is the tonal center. If you play G dominant seven, then C will sound like the center. They're different that way, but the keys of C major and F major are related since it's just the B natural vs. Bb that makes them different in terms of notes.
That's for making the music progress or sound like it's moving forward. Pop music doesn't always do that. Not all classical music does either, but from 1650-ish to 1900 most of it is. In the 20th century they did go in different directions -- It's been done and it is taught and it's not something you would start off teaching to a beginning music student.
I didn't study out that blog post. Didn't look that interesting, but the blogger appears to be some of kind Australian educational piano composer.
https://elissamilne.wordpress.com/category/about-elissa-milne/Out to change the world. Everyone is wrong and only they know the true way things should be done. Haha. Looks a little more interesting if they're a composer or music teacher.