Our KDE development motto (and a contrast explained in our HIG) is "Simple by default, powerful when needed". It's nice to see someone re-state it so naturally and eloquently in the wild!
Not just Dolphin is among the best in class.
I have been a hardcore Konqueror user back in the days. Early dolphin felt like a back step. Nowadays, thought, it easily outshines Konqueror. I still miss a few KIOs which were showcased in Konqueror. I guess they were discontinued.