Re joint engagements I think there have actually been quite a few recently
St Patrick's day
The thing for Charles at the palace
Baftas
Commonwealth service
Blackpool
Northern Ireland
Dundee
Which seems in keeping with Harry and Meghan and more then Edward and Sophie or even Charles and Camillia who seem to do lots of separate visits just for context.
Also agree with pp both William and Harry seen to have been doing as many engagements as Meghan abs Kate but they get very little attention when the are on there own Prince Willian was at the world economic conference in January you barely heard about it. Although I do agree there is definitely a long way to go before they are over worked.
I don't like the Camillia article it reads as bitchy and nasty. And I'm not sure why if he has been playing around she needs to direct that at Kate? But I don't k is anything about her to know if there is likely to be anything in what she is saying.