Apple, unlike many Android outfits, supports their hardware for a pretty long time. This chart (https://www.statista.com/chart/5824/ios-iphone-compatibility...) suggests that they're supporting devices up to 5 years old; since the SE is just 2, it has a good 3 years of software and security updates to look forward to.

Microsoft is still supporting several of their smartphones running Windows Mobile. The latest update (https://support.microsoft.com/en-us/help/4316692/june122018k...) was in June of this year. I still have a Lumia 950 and it works fine.

Compared to OnePlus who stopped updated their OnePlus2 past Marshmallow after telling subscribers they would get the Nougat update. This effectively dead ends this model for users. Got rid of my 2 when I found out:

https://gadgets.ndtv.com/mobiles/news/oneplus-2-android-noug...

The iPhone 5S, released five years ago, runs the latest iOS version.

This is what always bugs me about recommendations to buy older devices as a solution to all problems. Updates = security.