Your first example is one I use often; my best friend has had an on/off relationship with the guitar for decades now, he’s a bitch picker. The way I dial in tones requires that exact kind of right hand pressure to get everything played sounding full and consistent. It took me about 5 years to explain to him why it sounded different when he played through my rig than when I did. For a while we were both playing XXX half stacks when we played in a band together, he used to have me dial his in for him and then would ask why his settings were different than mine, despite using the same pickups in our guitars at the time. Everything was exaggerated on his amp to make up for what his right hand wasn’t doing, or the lack of sustain from not fretting notes with man pressure.
Also, I had no clue Josh was from across the pond but I got that same Sea Shepard shirt!