To 'midget fingers McGee' (me) thinner necks were appealing because I could get my hand wrapped farther around the neck, and my fingers could move faster.
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The benefit of a thicker neck is beefier strings

The thumb goes on the back of the neck, and the finger approach from the top. There is really only 1/4" depth difference (or so) between thin necks and fat ones, so a thicker neck doesnt realy alter your LH technique much at all, and not where it matters. It really doesnt effect playability, if you have a proper technique, IMO.
The benefit of a thicker neck is beefier strings, and better tone.
Does a preference for thin necks mean small hands and/or bad technique?
1, While in a jazz performance program in College, I learned to approach the neck with a very relaxed, open hand position, similar to a classical guitarist's. Combining that with eight to ten hours a day of play time during first year, made fingering speed much less of an issue.
2. During that period, I also discovered that I could get a more expressive vibrato and a bigger, beefier tone, off an instrument with a wider-than-average fretboard.
I have huge man hands with long fingers. I bought a jazz bass and HATED the neck. I started out playing 5 strings because the big necks felt so good. My four stringers (a P and a J) both have P necks on them.