> This is really an Apple thing, rigidly enforcing whatever their current OS aesthetic looks like.
It's not just that I think, using their native components also ensures accessibility and consistent UX throughout different apps, which is a huge benefit to e.g. screen reader users. Everyone else - especially web interface builders, especially if they eschew just using native elements - reinvents the wheel and considers accessibility as an afterthought.
At least we have laws now that mandate accessible websites for corporates, in addition to government sites.
most web elements are actually native components. The advantage to letting the device/OS decide how the components work is that say a handheld device will handle the drop-down select-box in their own way, allowing for new devices to improve the user experience.