So implementing this took zero work? Probably not. Do you think it will cost nothing to maintain? Probably neither. So I don't see how "in no way" could be true.
But costs don't hold us back from developing amazing new features [for developers and consumers] for the future. <3
-- This is largely work that already existed in the older Edge instance, just made more seamless and with a proper allow-list to make it more secure.
It didn't take zero work but it didn't need an overhaul of the DOM or anything like that.
Nor does it have to be the same team/people working on both.