There is no reason to keep it. It’s a throwback to the Jim Crow era and undemocratic. That undemocratic part is why the Republicans love it so much that they changed the rules from:
You have to stand in the rotunda speaking for hours tieing up the system till you win
To:
Single email saying you are fillabstering it.
Manchin and Sinema said if they touched the fillabuster in any way, no bill will make it out of the senate. That’s why it never got ended or at least make it harder to fillabuster things.