With improved Murray and recovered Harris, better backcourt duos are all 4 which are listed better: Lillard & McCollum, Curry & D'Angelo, Harden & Westbrook, and Mitchell & Conley, but also Simmons & Richardson.
There are also several NBA duos which are not clearly better than Murray-Harris but not clearly worse too, and some of them are not even mentioned in this BR list, so Murray-Harris belong to #6-#14 group with Oladipo & Brogdon, Butler & Dragic, Irving & LeVert, Fox & Hield, Walker & Brown, Booker & Rubio, Paul & SGA, and Ball & Holiday. Where they are exactly between #6-#13 we will see very soon. And also don't forget about L.A. rumors that Kawhi Leonard will actually play SG in Clippers and even LeBron as PG, which will create more cruel backcourt competition this season. But as I am already pointed, our overall backcourt lineup when we add our great backcourt backup options Beasley and Morris are better than when we just look at our backcourt starting duo.
If Murray-Harris is a little bit overrated in this article ranked as #5,
according to nba.com article Murray-Harris are #14 backcourt duo for the upcoming season, which obviously ignores every projected Murray improvement and Harris recovery, which is the reason why they are so much underrated in that ranking.