is there even advantage to starting a resp with cdn/us dual citizenship as residents of canada since the irs taxes on gains as per form 3520?

i see little advantage to contributing to resp to my dual children (spouse and i recently moved back to Canada, now Canadian residents and citizens, never usa citizens). the benefit of the resp is the money grows tax free for education, but the irs does not recognize this as you pay yearly interest. why bother to do it in my particular case?