Okay, I have this problem of short fingers. I just want to mention, It won’t stop me from playing fast, or enjoying, or creating music. As others have mentioned, there are lots of players who have limitations and figure it out on their terms. My fingers are short, yep, way short (pinky measures in 2.25’’ says, the boxing announcer, haha) I started playing in the 80’s but have always found it difficult to minimize string noise, especially lift off noise when going up to the next higher string, or ascending. I also ‘PLAYED’ a RG super thin neck, by accident. After 15 unpleasant RG years, I play a PRS CE-24 (doesn’t matter which brand, just slightly thicker neck is the key, FOR ME. The neck fits my hand way better. I have gotten better at reducing tension but still not relaxed enough when stretching reaches my physical limits. I would imagine if anyone stretches past (his/her) reasonable distance, bad things will eventually happen. I’m in this until I can’t do it but it will only be due to physical issues. This is a bad recipe for me, to stretch as far as ‘so and so’ even though we are physically not even close in size, or even skill level. JP had his first instructional tape in the 90’s and I could only physically get through, may two iterations of his 1234 chord exercise. I simply don’t have the reach so as a result, you find different ways to play chords, maybe chord fragments, or 3 note chords, ala Ernie Berle via Guitar Player.
Again, this is my experience, but getting away from a thinner neck helped reduce some of tension and fatigue I had in my hands. However, I was clamping down way too hard with my left hand and to this day, I am still working on this. I can stretch decently but what I lose is the ability to get my index finger under the lower string to mute it out so I lose control in the ascending direction unless I use more staccato which I don’t prefer the sound of as much. So, while I can stretch decently to play fast, I have limits because wide stretching creates too much left hand fatigue and eventually tendonitis.
I suppose my workaround is that I use the middle and higher registers to compensate. I don’t play 3nps lower than the say, the A Ma (5th pos) unless I am only playing scale fragments. I also tend to play scale patterns that fit my hand better. For example, I like playing in the Locrian position and then shifting up into the natural minor position which helps keeps the stretching to a minimum. I create my own arpeggio patterns which are more horizontal than the straight up and down arps.
In the end, you definitely can learn to play fast because you need your right hand as well unless you are only thinking legato style. I suggest, playing in areas of the neck which allow you more left hand ‘freedom’ for stretching out. I now spend most of my time playing ONLY what physically is comfortable because I want to continue to play for 2 hours a day so I can continue to develop my own way of playing. The limitations will ultimately guide you to YOU, your own personal way of expression on guitar.
Again, I will keep working at getting my index finger under that next lower string but it has shortened my already short reach but it is what it is and I will also be mindful of reducing tension in my left hand by playing more realistic scale patterns when traversing the depths of the lower register.
Good Luck and thanks for the post!