We have been waiting for years. Hope that the accordion UI components will be there in Ionic 6 
Thanks Team.
Yes, thanks for the link. It would be best if Ionic could have its own expand / collapse UI component.
Why? What additional value would it provide
A more native mobile experience is expected for Ionic UI components. Besides, there is a sense of incompletion when there is a whole brunch of Ionic UI components without the Accordion (expand / collapse component). Ionic components allow us to create quite nice UIs quickly out of the box. I use them quite a lot.