The new Rocket 3 6th gear is much more overdriven than the old Rocket III 5th (0.838 vs 0.964), but there are differences in the primary gear and (based on a photo) torsional damper ratios between the models which negates the additional '6th' gear and makes it effectively the same as the old 5th for cruising rpm.
Bit of a fail by Triumph, quite possibly, you do indeed have more shifting to do, but then again my Rocket revs lower in 5th at 80mph than my Hayabusa does in 6th.
A new, and rather expensive, bike
Can you do 80mph (preferably on GPS) and get the rpm from your tachometer?
I've had these calculations done since November 2019, and have been waiting for someone to give us the real top speeds per gear etc!