It's funny, because I thought that they wanted to steer away from magical bonuses and enhancements which were almost required to make some good character builds in 1e...but it seems they did the opposite?
Choosing half-elf ancestry equates to being just that, gaining only half of everything the elf ancestry gets. There are no benefits.
The half- ancestries are supposed to be versatile, but how can they be versatile when there's nothing to work with at level one?
Also doesn't making the half-elf and half-orc available only through the 1st level human ancestry make them not actual ancestries? Just ancestry feats of human?
Yeah, I get they're trying represent their mixed parents, but now it shows the half- ancestries as lackluster. In 1e, their diverse parenthood was celebrated by giving the half- races with abilities that rivaled the other races.
I suggest that the half-elf and half-orc automatically gain the benefits of the half-elf ancestry feat or the half-orc ancestry feat and still get a 1st level ancestry feat.