Perhaps the issue is that most "neck through" basses have 24 frets (not all but most). Giving the bass a different feel over a "bolt on" with 20 to 22 frets.
My opinion means nothing but I personally do not like more than 21 frets with a 20 fret Fender my preference.
I have an old 1986 Carvin LB90 with a glued in place neck which resembles a "neck through". It has 20 frets. It's really nice how the neck slopes into the body.
This may sound stupid but where the neck bolts into the neck pocket is my reminder to not go into that high register territory.
To each his own.
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