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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.
with omnium my main question/issue is who likes to sit with their feet flat on ground?!
and if Load tips on the side, quite a lot is well protected by the frame around the seating area