What I mean is some are saying stretching your fingers out is good for guitarists hands,but it's bad for bassists hands.
Good for one should be good for both.
Bad for one should be bad for the other.
Who's to say it's actually good for guitarists in general. Some people can get away with doing crazy stretches without injury. Some can do crazy stretches for awhile without injury, and then they get a nasty surprise. Others would incur an injury fairly early.
I use one finger per fret on my #1 bass probably >95% of the time. That does not mean every bass player can or should use one finger per fret.
There are also times high on the neck where I might stretched to cover 5 frets on bass or 6 frets on guitar.
I suspect doing this would destroy my wrist in a matter of seconds.
It's okay for people to explore their personal limits, but it's advisable to do it carefully because you can actually hurt yourself.