Let us look now at the pro thinking behind the new developments.
This example is from Kono. White 1 is the main move nowadays, and it has now been concluded that Black 2 at A, which is answered by White B, is not a good idea as it leaves White in control of the game. So Black has to pincer at 2. Then, however, White gets to play at 5, which is too good a point for Black to be happy about. But, goes the thinking, if Black had been able to play the exchange of C for D beforehand, he would have been delighted with the results of his pincer 2.
This "what if" process is a sort of tewari in reverse, and is a common fuseki technique.
We are going to leave you to look up the original article to see how Kono looks, rather extensively, at how White might play if the C-D exchange is in place. But we will tell you that a White move on the lower right side or the approach at B in the database map turn out even worse than usual because of the black stone in the lower left. Also, White, as ever, is entitled to "adapt to circumstances" and moves that were not so good before might look better with the black stone in the lower left in place. Consider this variation where White has shifted across one space from his usual first approach move.
White has achieved sabaki and Black is now obliged to go back and defend somewhere around A.
At the risk of stating the obvious, when Black does try to interpose the lower left approach move before making his Chinese shape, he runs the risk that White will spoil his plans by playing on the right. Or, as a more specific instance, if White answers the lower left approach move not with the knight's move but with the one-space jump defence. Black perhaps should consider switching to the Kobayashi Fuseki (lower centre star-point).