Maybe I misread his statement that fretless bass guitarists have poor intonation. QUOTE]
Yes, you did. And there's nothing absurd about what I did say. Perhaps I went overboard using the word "vast", and should have kept it to a simple majority. But I stand by my assertion...that the majority of bass players who own a fretless have poor intonation. BTW, I consider less than excellent intonation as being effectively poor...either you is or you ain't in tune. Out of tune doesn't cut it, fretless or otherwise. There are many bassists who do have marvelous intonation on fretless, but they most certainly do not constitute a majority, nor anything approaching one.
Good intonation is not only a goal when playing fretless it is an absolute necessity. Good intonation is acheived when the player consistently places his or her fingers at exactly the correct point on the fingerboard. That skill is only attained through hours and hours of practice, assuming of course the player has the ability to hear whether or not he/she is playing in tune. The appearance of one's fingerboard has no effect whatsoever on the sound, but certainly can influence how quickly good intonation is developed.