Hypothetical:
I file an IFR flight plan from Aiirport A to Airport B, with two intemediate waypoints. I have IFR capable GPS. Shortly after departing Airport A, ATC clears me direct to my destination airport which will save me some time and fuel but, for a few reasons, I want to continue with my original flight plan. Is there any reason why ATC would not approve me to continue with the original flt plan?