Hi Vincent - thanks for the explanation! This is really important to know at this is quite different from how websheet/excel active form and cube viewer work where consolidated elements by default can always be drilled down on. The new behaviour in Canvas while good on one hand in addressing requirements to define drill-down path and prohibit drill on element if not explicitly defined also has negative aspects like loss of flexibility for users and requirement to predefine for the report builder (what about rapidly changing dimensions or source system built dimensions where the structure might be unknown or subject to change?)
I agree with Andreas that “best of both worlds” might be needed.