The breaking
This has increasingly bothered me with each book. I don’t understand how what seems pretty essential was lost to the white tower. traveling seems pretty essential. How did they simply forget to continue teaching it?
Edit: so what triggered me was Cadsune remarking that it had been lost since the breaking. That turns out to be just before her conversation with a wise one who knows the/a weave. This tells me two things, one (duh) the Aes Sedai really are stuck up muppets (love how the wise one points out they have to flutter their hands around but the Aiel don’t need to) and second the importance of strength to construct the weaves.