I think generally it’s supposed to be a kind of suboptimal sequence. Like you can play that way if the corner is in danger of dieing, but it lets white get really thick on the outside.
The idea of the descent or hane is that White can try to live in the corner, make black a lot stronger on the outside, and in exchange black gets to then invade and attack/split the two and one white stones on the side.
They become weaker as the black wall gets stronger.
Playing around with some ai ideas
I had a game at the go club last week that looked like this
Black takes the corner from white, and then white uses the strength to counter attack and break the bottom area of black and also gain back a few points. 16 might’ve been a slight overplay.
Anyway, later black actually dies in the corner with a ko, although I think we both misread the tsuemgo 
I think white was generally ahead, since the top right corner.
There’s also another playable sequence sometimes from
but white also has the nice endgame move A later, and again sente like the other variation.
But a better explanation might be by pro players
Possibly related
