not sure if you could call the plot in this a retcon or just a very late and unsatisfying reveal but its one of those. if i was writing this i wouldve made the doctor press the damn button there are other ways to make gallifrey still exist without having a mcu avengers type battle. the crossover was definitely cool though and i suppose there isnt a ton of storylines to choose from for a crossover episode so i have to say i guess i sort of get it. i feel more positive than negative at this episode but i can tell why some people hate it (although its also just incredibly hard to keep everyone pleased when it comes to a crossover anniversary special in general)