I think you were ill-informed. There is a difference between how Apple updates iOS and Google updates Android.Well, that is something I won't be doing. I've only recently moved from Android because I was fed up with phones only offering one or two major versions of Android. At least with iPhones, you know Apple will update iOS for five years or similar.
Apple updates are monolithic. It is all or nothing and hence receiving an update is mandatory to enjoy the latest features.
Android updates work differently. Yes, they have annual OS updates which have interface updates and under the hood improvements.

Android’s underappreciated upgrade advantage
Yup, you read that right. And it's as true as can be, even if Apple does everything in its power to make you forget.

But with Android, those operating system updates are only half the story. For well over a decade now, Google's been pulling what were once core operating system elements out of the operating system proper and treating them as standalone apps instead. That means those elements — all of which are still considered part of the single-bundle operating system in the land of iOS — get updated numerous times a month, all throughout the year. And those updates reach every single Android device within a matter of days, regardless of which company made it or how long ago it was released.
Yes, security updates are an issue.