This is where I am. EF->R transition is the time to consider if a system switch is right. The R lens pricing, 3rd party lens lock out, teething issues (heat, focus etc) have me hanging on to my 5D IV for now. I think computational features will be increasingly important, that'll really need some sort of ability for 3rd party 'apps' on the phone and I don't see Canon adapting gracefully to that (or at all) so I'm concerned I'll have to switch to get future features I'd love. (ex: Goal, ambient light balanced strobe for action in a large area, 10fps+ at reasonable flash power, ambient light trains behind subject: App that provides 2nd curtain sync to wireless monolight [Canon restricted feature], and rotates between a bank of monolights [say, 2-4 Einsteins?] or possibly two banks) That's the sort of thing I don't expect Canon to add as a built in feature, but that'd you'd need cooperating code in the camera to do well and ideally you'd want some camera<->strobe coordination.
On a side note, is there a spec list that shows which Canon cameras allow 2nd curtain sync via 3rd party monolight trigger? I've missed that feature since I retired my 1D Mk II (and can't justify 1D prices for my current hobby only situation).