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Junior is 5 and still fits on a Yepp , and as I removed the seat's feet to fit it forward, leg length isn't an issue.
The backrest fits even an adult facing forward, ideally paired with the extender bar and its cover.
Canopies are handy for sure but as a car-free family we've managed daily riding in all sorts of weather (it's not like Denmark is warm or dry) without one so far. This last sentence was sponsored by Reima of Finland.
OK, I'll bite. That pic is ancient (as you know full well),now there's the option to fit a regular child seat up front if wanted. Saying so having the legs stretched facing forward is a pretty popular option, it's like a chaise longue.
Passive safety is one thing, but it's easier to get out of trouble in traffic to start with on a 20kg maneuvrable bike VS a 2.5m long anvil. And it's still way safer than a seat at the back of a regular bike regardless.