Because it is considered to be blasphemous by the true believers. This is only half in jest and all the more remarkable for the frequency with which the apostles of Apple need to defend user-hostile changes.
It looks like a combination of Effort Justification [1], some form of Confirmation Bias [2] and some form of Learned Helplessness [3] to me: given the money, time and effort spent in buying into and learning the ways of the Apple world and also due to the way that world creates a visible distinction between those inside the walls and those outside - blue and green text bubbles etc - some users get caught in a vicious circle of gettin the latest Apple thing, finding out about a user hostile change - ports gone from laptop necessitating a herd of dongles, 'butterfly' keyboard breaking due to unavoidable common contaminants, drives and memory soldered to mainboards making user-upgrade impossible, spare parts serialised making user or third party repair impossible as well as the software devolution described here - and needing to decide to either go with the flow or jumping ship, again. They choose to go with the flow but feel the need to defend the change to suppress the feeling they are at the whim of the company.
