I started out playing guitar when I was younger and developed more of a finger-style picking technique. When I switched to bass a few years later, I tried using a pick but kept losing them (ADHD kicking in...SQUIRREL!). I started using finger plucking style shortly after I lost my last picks and because all of the cool players utilized that style. But I kept coming back to using my thumb and fingers in a finger-style manner because it was easier for me to control the dynamics/palm muting and I found I had better speed/control when playing faster parts. Much like playing classical guitar. A few years back, I rediscovered Sting and the Police. I noticed that in the late '70s, he was using picks but later on he started using this kind of method. With it, I find that I can easily switch back and forth between finger-style and finger-plucking. This video of the Police in Rio shows what I mean.