I have been using Miracast since 2013 with both Windows 8.1 devices and Samsung galaxy phones, without any dongle. And I have been annotating pdfs since 2012, with a Samsung Windows convertible (with 3G by the way). But since Apple caught up with the introduction of the pencil I have also, and lately mainly, used my ipads pro to annotate pdfs... I don't live in the Apple ecosystem though... my main phone is a samsung and my main PCs run WindowsThe funny thing is that it’s the opposite for me. I have been using my iPad Pro for tasks which couldn’t be done on my work laptop for many years now. Airplay mirroring (we would only start getting miracast dongles late last year), annotating on pdf documents (teachers have to first open pdfs in edge?), scanning documents and just playing nice with my iPhone overall.
Some other reasons I prefer using my iPad over my windows laptop during meetings.
1) I can use the camera to scan QR codes, while the smart Keyboard Folio makes it easier to type in responses unlike my other colleagues who are thumbing them out on their smartphones.
2) Form factor makes it better for use in the lap in portrait mode. Longer battery life and always-on 4g as well.
For the things I do, the iPad is just faster to access, and I don’t have bloated windows getting in the way of what I need to do.
PS for some things Ipads are faster and nicer while Windows stands in the way, while for others it's ipados that stands in the way and Windows works much more effectively....