rr32btg
Inspired
I agree that technique is the first thing that really matters, the second thing is which tone is used, but as you said before there are physics effects that persistently transfer vibrations to unmuted strings.Because the sound of the strings you're playing and the sounds of the ones you don't want to ring are not differentiated. And I didn't say Steve used a damper in the video, just that that's something that can help. Try experimenting with different high-gain tones. Some will force your technique to be near-flawless, or it will sound like crap. Just not lifting your finger off the 10th fret of the B string the instant you play a note on the 7th fret of the E string will cause a dissonant chord to sound, with a real high-gain tone. Others, not so much.
I use these sorts of things as ways to improve my technique. High-gain tones act like a magnifying glass to sloppy technique, which helps you zero in on what needs work. Sometimes it takes someone else to watch how we're playing (a teacher, e.g.), to help identify what areas need work. Personally, I don't want to rely on effects to cover up flaws (like back when I was a kid, and would turn on the delay during solos), but instead, use them to enhance my tone, give it depth, tighten things up, etc.
If I hit directly one string without touching others all they will start to slightly vibrate whatever my technique is perfect or not. It caused by the fact that the guitar conduct sound waves very well and vibration from one string goes to another. I understand that it's physics and nothing will change that no matter how good my technique. Yes, good technique can reduce unwanted sounds but they will be always there.
But also I know that if I turn my amp gain at max and place a couple of maxed out boosters/drives before the amp I will have a really noisy sound whatever my technique good or bad.
With string muting my sound is clean from unwanted noise and overtones and I'll feel it's good. I trying to play clean as I can or even cleaner, I'm not touching strings that shouldn't sound, trying to not use too much of gain, but if I will not mute unused strings my sound will be full of unwanted sounds. If I play only on the B string the A, the D, the G, and the low E will vibrate too if I will not mute them.
And when I watch that Steve's video where he plays with plenty of gain and at the same time without damper, muting strings, and without producing unwanted noise, I see some kind of magic in it all.
I don't believe in magic, but I believe in technique and proper sound setup. So if my technique is not perfect but at least normal in many terms, maybe there is something that I miss in the sound setup.