I have both a 2016 R/T Manual and a 2018 SXT Plus. I do like the 8 Speed auto in the SXT but still believe a true muscle car should have three pedals.
Although I will say that 8- Speed auto with a set of HellCat paddles shifters is awfully nice once you learn how to truly use them.
I just traded in my 2016 Scat Shaker with a 6 speed manual for a 2019 Challenger 1320. Auto is only option. Much faster than my manual. My live in girlfriend's back problem triggered the trade. She was unable to drive it without suffering later on. I do love a stick, but dont regret the trade. The 8 speed in the 1320 is built to drag and shits hard. Even barks the tires in shifts. And shifts way faster than a manual.