> Crucially, it syncs feed read state between my laptop and phone.
This is via iCloud and only works for iPhones/Macs. What’s great though is that NetNewsWire also supports RSS feed aggregators (I personally use FreshRSS) so that you can sync RSS read status over all your devices, even non Apple ones!
I’ve been tempted over the years to switch to other RSS apps, but this feature is what keeps me using NetNewsWire.
I use https://miniflux.app and use that to sync NetNewsWire across my devices and across RSS readers. I'm using Reeder on my iPad, Miniflux on the web and sometimes NetNewsWire on my Mac.