Interesting. I have a new guitar with a rather thick neck. I specified it to the man building the guitar for lots of reasons.

My left hand, especially the root of the thumb aches after playing it. Barre chords require my thumb to be hardly around the neck, which is anathema to me, a hang over from being classically trained on violin.

My hands are huge with big sausage fingers. (I used to tune up a viola to GDAE to get my fingers to play violin better) so it isn't that the neck is too thick.

All this talk of hand conditions can make a poor bloke worried! (As an ex miner, I have been tested for vibration white finger. They were initially worried about my left hand sensitivity to hot and cold till I showed them my guitarist finger ends!)