A performance A aircraft from V1 on must be able to become airborne safely, clear all obstacles by the required margin and fly to a place where a safe landing can be made.
Presuming all goes well. Theory versus the real world, I'm afraid. Reads better if you replace "must" by "probably should on most occasions".
The only thing that being VMC gains the Performance A operator is the ability to determine track accurately and thus reduce the size of the area in which obstacles have to be cleared by the net minimum.
Depends on the rules applicable. eg in Oz, above a specified MTOW, the takeoff has to be predicated on the presumption of IMC. In any case, with the usual jet pitch attitude, I suggest that it is folly to attempt to eyeball a critical departure.