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Yeah (but as another commenter says, a cul de sac only for cars, not for bicycles or walking).

It's not designed for stop traffic totally, just to disincentivize some (most maybe?) kind of traffic. The idea is also make those areas kind of "independent". In the sense that they should have most of all necessary services. Places for buying your groceries, medical services, small business..

Of course, in practice it's not ideal, they are still learning.

Cul de sacs are for street hockey.

Cul-de-sacs block all through traffic, not just through traffic by cars. This typically makes getting around impractical without a car.

Superblocks to my knowledge do not, you can exit anywhere on foot or by bike. Basically it makes getting around outside a car the more convenient option.

Not always. I've seen neighborhoods where the end of the Cul de sac connects out to walking/bike paths and green space behind the houses. So bikes and pedestrians can cut through at those points but through traffic for cars is killed, meaning only people actually going to the homes on the street actually drive there.

I do agree this is far from the norm though.

Yes and no. It's sort of a cul de sac for cars, but it's permeable to walking and biking.