iMessage, Apple Pay (w/Touch ID), native Apple Music client, iCloud (if you're invested in the iCloud ecosystem) along with its seamless integrations with photo apps like Photomator (among others), shared music and movie library across my Mac, iPhone, and Apple TV.
There's probably a lot more I'm not thinking of right now. Point is, if you're an iOS, macOS, and iCloud user you give up a lot of quality of life bits going to another platform. There are times I want to go back to Linux, but when I think about the stuff I'm going to loose I talk myself out of it. macOS isn't the greatest, but it's not the worst either and Apple's products and services just tie in very well with each other. I get annoyed by things like the shitty support for non-apple peripherals, needing 3rd party apps to make them work decent, crappy scaling except on the most expensive monitors and no decent font smoothing when running at native resolutions. But... I stick with it because I either like or love the tight integration and added quality of life that comes with it.
Ah, I get it. I don't like integration of this sort, because it quietly screams "lock in", but do I see how it can be very convenient. So I make do with my own, likely inferior, using Syncthing, and Google Photos for browsing. My music is mostly CD rips, Bandcamp, and some YouTube, and I don't do TV, so it's just easier for me than for normal folks. I can listen to my collection anywhere over a Wireguard connection on my laptop or my phone.
It's a different set of trade-offs; less polish, more control.