the bass lines are often quite sparse or "carefully placed" for the recording, and can sounded a bit lifeless live if you don't fill them out
I will take your comment with a "
pinch of salt."
That's why those notes are "
carefully placed" to be there. I have figured out that, "
usually," that "desire" to
fill out those quite sparse notes or "empty space" of the studio bass-lines are linked to numerous causes that are rarely associated with musicality and/or MUSICIANSHIP.
(It's a slightly different discussion about the causes of having the need to add more (noodling

) extra notes while playing live. One of the reasons could be the player's
insecurity (for this/that reason.)
N.B. I agree with Pacman's statement in the comment just above yours, "I don't think
anyone seriously expects note for note playback from any musician."
But, it's not bad to know (or memorize) the original bass-line: its mood, its tone, the rhythmic pattern/s (as a template), accents, nuances, fill-ins, etc...
What if a guitar player or a drummer, or a keyboard player starts also "
changing this, adding that" -
and not once, or twice - during the live concert?
I'm not against some subtle changes but anything more - you are rearranging the song/track and every member of the band should be aware of it.
Unless, "
nobody cares about your bass-line."