It may not be a winning concept in the modern era. Dorna have expanded the calendar to accommodate more fly-aways and new circuits. However, building bikes to win in the European theater has been widely regarded as a smart strategy for decades. I think some manufacturers stay with this strategy since the participants have access to far more data about the old tracks than the newer tracks. Testing is quite restrictive so using that data might still be the best way.
Time will tell. I personally think KTM are too optimistic, especially with 8 Ducati’s of varying spec in the field, but maybe they will make a good showing this year.