It's personal. The one finger per fret is very common but a relatively new innovation and three fingers were used by many of the greats in the past on some of the most important bass recordings of all time. Double bass players mostly use three fingers (a small number use four). After 33 years of playing, I don't think it matters as much as you think. Most players I know have muchmore technique than they know how to use so the discussion is academic. It is the difference between playing to play great music and playing to impress people at parties. The miniscule differences it makes in the overall delivery of the music is too nuanced for most people to care.
Interestingly, I have occasionally tried to play with one finger, as an exercise. YOu woudl be surprised how much you can execute with just one finger on your left hand. Django Reinhardt had only two usable fingers in his left hand and defined a genre of guitar players! Necessity is the mother of invention.