Maximum Torque is over before the red line - so you should have already changed up.. for maximum acceleration.
This motor is happy between 4,000 and 7,000 rpm - which should be enough for most... if not ... buy a faster bike.
V Twins do not rev like an inline 4.
My Multistrada will rev to 9,500 - but in 6th you are already doing 150...+ - in second probably 90..
My older inline 4 on a Faser 1000 Yamaha - would do about 120 in second... because it reved close to 13,000 RPM (from memory)
If you like high revs - but an inline 4 not a V twin.
My VFR1200 also had a similar rev restrictor in 1,2 as a protection from Honda from spinning out back end / limit wheelies? There was a device that you could plug into the gear change sensor that made it think it was in higher gears - to allow you to rev harder.. if you wanted to remove the restriction .. but it screwed up the dash gear display indicator..
My guess is Ducati does it to protect the engine from over revving - rather than this on the 800 scrambler... as it only has half the HP the VFR1200 had...but its a guess.