And who decides that? Zinchenko wasn't a LB until Pep put him at left back at 20 and now he's been a LB for 9 years and has played 90% of his professional games there. Is he a left back yet?
John Stones has probably played more games in his career at RB than Livramento - which one's a RB?
If there was a Kyle Walker replacement the club would go out and buy him.
There isn't. So we could either buy a substandard RB just so a bunch of posters on here can be happy we finally bought someone wikipedia calls a RB, or Pep can put his trust in players he rates and win around it like he did all those years with Delph and Zinchenko and all the trophies that brought.
I guarantee if you got what you wanted (some random RB just so you can feel better that we have one) it would just be Angelino all over again. He'd sit on the bench watching the "not really right backs" play ahead of him because they're better players.