I work in UX and this isn't unintentional. The copy "Facebook doesn't save your password" proves this was intentional. I'm sure the PMs there are all drinking the cool-aid and are rewarded in getting as much data from the user as possible.
I bought a $180 Xiaomi Redmi 5 and I was surprised that it opened apps faster than the iPhone 8 Plus. Apple better be careful because low-mid range phones are catching up.