With all due respect, you ain't never seen old video of George Shuffler playing bass. That was his first instrument (and his instrument of choice over the guitar) when he first went to work for The Stanley Brothers.
George would regularly visit the fingerboard extension, often times hitting harmonics and playing constant 4/4 walking bass, hammering it hard and regular.
His younger brother John (who also played and recorded bass with The Stanley Brothers in the early 50's) could do the same thing.
Their view of bass rhythm was sort of like Tony Rice's rhythm on guitar. There's lots of other places where the rhythm can lay in music, besides the 1 and 3 beats (regular bass beats) or the 2 and 4 beats (mandolin chop).
To quote Butch Robins (one of Bill Monroe's best banjomen IMHO) "I used to love to get to jam with John Shuffler, since he can walk that bass so good he can drive your A$$ up a wall."
It ain't everybody's cup of tea with regard to bass playing, but it helped to define The Stanley Brothers early sound.
And if you ask Tom Gray (long time bass player going back to the early days of The Country Gentlemen and The Seldom Scene) who his bass heroes are, he'll tell you in a minute that it was George and John Shuffler.