To accommodate the extra fret(s), there are essentially three choices:
- Deepen the neck pocket. Advantage: Fender-style ergonomics are maintained. Disadvantage: poor access to the extra fret(s)
- Leave neck pocket alone and move bridge toward the center of the body. Advantage: easy access to the upper fret(s). Disadvantage: as explained by BIGEJ2, ergonomics change: feels like you're reaching out farther for the "money notes"
- Go with choice #1 and redesign the body: i.e. deepen the lower cutaway, which might spoil the Fender aesthetic
I can understand why Fender CS wouldn't want to do #3. I'm guessing they went with #2 because they assumed that someone wanting an extra fret would expect easy access to that fret.
I empathize with BIGEJ2. I owned a Spector for awhile. I
loved the tone of that bass, but eventually realized that I couldn't deal with the ergonomics of a small-bodied bass with 24 fret neck. To make that work, the bridge was practically in the middle of the body. It's all well and good that there was easy access to the topmost frets, but the money notes felt out of reach unless I pulled the bass over to my right, which was not comfortable for me... and the neck wanted to dive. I know, there are plenty of guys who love Spector: they aren't wrong; I'm just sayin' I'm more comfortable on Fender-style basses on which the bridge is closer to the butt end of the bass. I prefer the "hang", so to speak.