Because Ducati motorbikes are currently very difficult for other manufacturers to stop, even though KTM could also be a threat this season.
I read that the reason why Ducatis bikes are generally faster for the last few seasons is because they've been developing aerodynamic tech to compete with other manufacturers[1]. Not sure how true that is, but at the very least they seem to put more focus on that front based on what I've read so far. Makes sense for them to do it though, especially if other aspects have been heavily optimized based on decades of racing data. On the other hand, this trend seems to be frowned upon and some are suggesting there should be a new rule to limit how far manufacturers can modify their bike to gain aerodynamic advantage.[1] https://www.the-race.com/motogp/ducati-radical-motogp-aero-2024/
