...because he established right from TEOTW that a huge amount of knowledge from the AOL got lost and thus Aes Sedai could have it wrong. That left him plenty of room on purpose to revise their knowledge later on.

But my hunch is that you're wrong with this one. It's there right from the beginning with LTT. It's one of the basic principles of the OP and it echoes the cliché that men are physically stronger and women are better at delicate jobs requiring fine motor skills beside bringing the aspect of how saidin and saidar, men and women, are equal yet different, in opposition yet complementary. It's a pretty central feature of the series to have been introduced only late in the game, and don't forget RJ worked many years on developping the central features of the series before he got to write the first book.

Most likely, the general principle that women are more efficient with their weaving, and men accomplish the same tasks by using larger amounts of the OP predates the series. It's not to say that all the details of the OP were in place, but it's pretty obvious RJ introduced the OP in fairly vague, nearly magical terms in EOTW not because it was his conception and this later changed, but largely because he wanted to wait for the girls to begin their training to really show us how complex and technical it was (and he restrained himself early on to have progress and details to bring up later on), which in turn made Rand's task at mastering it on his own appear all the more challenging.

There are a few examples of AS having troubles guessing how strong men are supposed to be and such in the early series, or to draw comparisons with women, not to mention that between the culling of male channelers, the bad methods of recruiting at the Tower and the destruction of many records, the AS have little idea of how strong even other women could be in the AOL, nor of how strength was distributed.

How the respective strengths of men and women are conceived follow a logical development in the series. First Moiraine introduced the principle that it's said in the AOL they were equal, and then characters realized that men were quite stronger, then Asmodean began to explain to Rand (and us) that yes it is so, but it's balanced out by other things (like the fact strength isn't as much of an issue for women as they can link without men) that ultimately made men and women equal, but to all but Rand it remained for a long time that men are much stronger and more suited to destruction. Then the next phase was to introduce mixed gender work, and demonstrate that combining saidin and saidar was another level beyond the raw strength of men or the precision and speed of women.

It's pretty obvious why it had to be that way: the whole series centers on the two genders having been forced apart and struggling a lot to get back together. The lost knowledge and the misperceptions were part of the obstacles along the way. It wasn't until they linked again that male and female channelers started to really learn how they truly stood in respect to one another.