In a forum, I mentioned something about technique agnostic. Each person has their own experience and technique - so the not one-size-fits-all thing comes in. One person can just do what they need to do - but also thinking about the physics, and achieving velocities and/or acceleration relatively accurately and relatively reliably. The 'loose' can be from a particular perspective. Loose, but in good (or very good) control of body. When piano exponents look and study all the various techniques out there, which means gathering more technical information, then the exponent can make choices and decisions about how they play, and how they develop. This vid here helps as well - as it is also a source of information for which piano players can gain more insight into technical/physical/control aspects.
Absolutely. We must follow solid technique fundamentals, but I also feel like a great chunk of our technique will derive from our own introspection and individual evaluations of our executions. As long as they don't deviate too far from the fundamentals and will contribute to our playing abilities. That has been my experience, everytime I sit at the piano I'm discovering my own epiphanies on technique, and developing those associations
I think what people might mean if they say a "harsh" sound is not just the loudness, but also notes not being uniformly loud and some notes being much louder than others. I imagine the original video argues that relaxing your body makes it a lot easier to control the velocity of each note. If you play a chord and 1 note is much louder than the others, it's going to sound quite harsh.
Having teachers help us guide HOW to move at the keyboard critical! I have piano teacher tell me to "lift" my hand to the keyboard. After a few attemps and failurs, he says, Pretend you are liftingca bucket of rocks." I say, oh, I have lifted heavy things before! BINGO!! He wanted me to engage the the upper arm!!
It all comes down to insufficient practice or preparation. Chords need to be voiced. The transitions between chord choreographed. The pedaling needs to be studied. There's room for spontaneity but AFTER the groundwork has been firmly established. Whenever someone if grasping for the notes and hoping for the best, it always shows.
