Imo matt paints make a vehicle look “unfinished”, as if somebody pulled it out of the production line too early.
Subjectively also, it makes a lot of otherwise nice cars and fast editions of specifics models like Audi RS and BMW M series specifically, look like they have been madmaxxed and souped up. As macho, cool or mean that may sound to anyone, it usually devalues the vehicle more down the timeline.
Not sure how this applies to bikes, let alone slightly “mature” and civilised kit like an RT.
I do know of a mates unkept 07 R1200R in matt “graphitan” i rhink it was called, that 13 years on looks like an utter pile of crap. But arguably the paint is the least of its worries.