My approach to bass was always rhythm before harmony. The rhythm is what got me hooked and slap, by its very nature, emphasizes the percussive/rhythmic potential of the instrument. I also happened to be listening to a lot of Level 42 around the time I started to play bass so that definitely influenced how I perceived bass (even though I was also listening to a lot of non slap records). But I think a previous poster was right in suggesting that it depends, at least partially, on what was around when a person was growing up. If you grew up in the 70s or 80s (as I did) you heard slap bass all over the place - from funk to disco to fusion to top 40 pop - so it was just natural to approach bass that way. A lot of the slap you hear nowadays is all about licks - not texture. Man, Marcus Miller played on countless records with his thumb and it was all about texture, not speed and licks. I think there's a lot of pressure to be "fancy" while slapping but most of my favourite slap lines (Teena Marie's "Square Biz" comes to mind) aren't about flash at all and often feature plenty of space between the notes.