A concept I feel is not talked about enough in guitar playing is when you practice to pick as softly and delicately as you can. The reason being is in our body we have two different muscle activations.
One is full force employing the use of bigger less controllable muscles, and the other is almost no force employing the use of much smaller and more “controllable” or finer muscles.
The speed and control is all in those little supporting muscles, and that are activated and trained when you pull back on the picking force.
At first, like with everything it seems to delicate and not applicable to a real performance, but with practice these muscles and the nervous system controlling them becomes much more robust, the smaller muscles will over time be capable of much greater force and by nature, control.
If you’ve ever noticed your playing improve after taking certain drugs, beer, tobacco etc… The main reason is greater control and stimulation of these smaller muscles due to the nervous system being stimulated. Obviously this is a fine balance. But it’s no coincidence most performers best performances are while high on some drug. It’s the finer muscles that separate us from other apes. They can’t control them well at all.