He skipped Corsica because he could not get tarmac suspension nor test it in time. Also Prokop's mention of difficulties running the 2017 car come to mind...
Tarmac rallies are part of the WRC challenge for drivers.
And having the Championship in a major European capital city will bring great publicity to the sport there.
From beginning it is mainly about Rally2 car. But still there is question how 2027 will looks like in general...
WRC mainclass from 2027