There is a reason that some of those weaves were lost. It was discussed a lot on wotmania and here.

Traveling: The most logic reason was that for so many years during the Breaking, the landscape changed so much and so often that it eventually became very risky and dangerous to travel. Same applies for Skimming. If you think you know a place and open a Gateway, you might end up in the ocean or on a volcano instead of the place you thought it would be. Why was the weave forgotten? Eventually, most Aes Sedai, the more stronger and knowledgeable died, and with lack of a central organization resulted in fragmentation of the information. People were more and more isolated and didn't share the information.

Cuendillar: I guess the need for it became unimportant and eventually it just became less and less utilized so people forgot it existed. The perpetual decrease of strong Chanelers and maybe a loss of Talent in Earth resulted in Cuendillar being lost.

Balefire: Was forgotten by most but still known. I mean, Moirane figured it out and used it on 2-3 occasions. If Moirane who is a good Chaneler but not the greatest could figure it out, maybe from a book or from someone, it must not be that difficult for top people like Egwene, Nynaeve or others.

Angreal: Maybe they need some special tools, Ter'Angral that needs to be utilized to create them. This is one of the lost Talents I understand more why it was lost.

There was also a reason for RJ to have those lost. Imagine plot wise what it would of been if everybody had access to Travel and all those weaves. In a series where lack of comunication is one of the main aspect, it would of changed the feeling of the series too much. It would also depreciate the main protagonists accomplishments.