^^^
I'm not sure how much of that sort of thinking goes into the planning of engagements. Because until William and Catherine have 800 patronages each and are doing 500 plus duties a year, the tabloids will 'criticise' they don't do enough.
And if it's not engagements, they'd harp about something else. Charles does lots of engagements but that doesn't stop tabloids from inventing news ways to have a go at him.
Only the Queen is more less immune from the slings and arrows of tabloid writers but even that is starting to change.