Provide documentation of how we can use OOTB SPFX webparts together with custom ones, in particular connections between webparts.
e. g. OOTB listview webpart can be a datasourse for OOTB list webpart, but if I need to develop custom list web part I don't have any info on which events and which info I'll receive for it. Of course in this case obviously only on 1 item selection and properties of the item or just id of the list and item... But I think documentation will be helpful, espesially because previous request of open sourcing OOTB webparts was declined.