I found what seems to be a pretty key omission from an OGS joseki line that emerges from one of those newfangled 3-3 invasions. I tried to leave some comments but for some reason the comments got attached to this position instead of becoming a question about the new move. Linked here:
This is the missing tesuji, which greatly improves this line for white, so long as white has a working ladder to the lower left. Depending on the board situation, suddenly this branch may become quite much worse for black.
Why is this a much better move for white if whte has a ladder? Well this is the baseline we are comparing against that OGS has as the main variation:
Okay so after the new move, if black naively tries the same thing, white captures directly. Clearly a big improvement compared to baseline:
Black would better take once first, and take sente. But white later #5 capture still means that black has to come back with #6 to S19 anyways. So we get this. White is still much thicker than in baseline, due to having captured the stones off the board.
The obvious question - what if black runs? Then black gets into trouble too. White plays out some ladderish moves first then captures:
White capture is sente against the corner, black has to come back to S19, it’s too good to allow white to save and connect everything. But if black S19, then white gets 6 stones in a ladder.
So if ladder to lower left is good for white, this tesuji works.