Why on earth would you _still_ believe that iMessage is E2E encrypted? Even if it was _today_, _nothing_ prevents Apple from silently pushing an update that simply does not encrypt _your_ messages. And even if you trusted Apple on their word, they could still be sent a security letter (like here) from _some_ government forcing them to do it, and forcing them to be silent about it.
Simply put, sunk cost fallacy. Apple marketing has completely inundated and exhausted consumers by front-running a BS privacy narrative, to an extent such that users of their products lack even the vocabulary to meaningfully reason about and discuss what privacy is and is not; instead opining an opaque, closed source platform could defend their individual interests from asymmetrically powerful forces at all.