For some multi-layer discs- to avoid problems at the layer break.
And may be for 1 layer discs with small local defects
for example - see my test with BD-RE
I have several Mitsubishi BD-RE made in Japan with such high MAX LDC|BIS
https://ibb.co/Yx7J8rT
after 9-th record with preferred format the level of MAX LDC/BIS significantly lower
https://ibb.co/VY9NYpwr
