Which the majority of people think is a horrible experience. There's even a sibling comment in this thread pointing that out: https://news.ycombinator.com/item?id=48518721
Most shoulder-surfers who see my phone ask me how everything's so fast, and get me to show them the settings. Being able to disable the extremely-excessive animations many things have nowadays is fantastic, and is a great reminder that hardware actually has made progress in the past two decades.
(I use accessibility -> reduce motion, personally. less flaky than the dev options, though also less reliable)
Perhaps you should note the replies to that sibling comment
Unless you can back that up, "Majority" is something you're making up. It's a guess.
It also doesn't matter whether it's true if the majority or not- "Instant transitions are only good in theory" is not a true statement. Instant transitions are good in practice for many people and that has been true for decades.