I can't prove this from the text but I always figured that strength in the One Power was a lot less important to the Age of Legend Aes Sedai than it is to present day Aes Sedai.

I think your absolutely right. It would have to be when they have access to factories that can make angreal and sa'angreal. The Aes Sedai were highly specialized in their careers. I am sure that this would not stop them from say performing healing if its needed or for performing any number of other tasks. It wouldn't matter much what your strength is too if you can find a way to make a ter'angreal that can do the job the same way every time to perform a function. Remember the One Power was everywhere in the AOL because they had Standing Flows.
The more advanced culture of the AOL plus the enormous population of channelers probably had 100's of different ajah's instead of the extremely focused amount of 5 after the breaking.

Weak channelers are considered unfit by present-day Tower because they wouldn't be able to kill a trolloc horde by themselves while weaving a 100 useless weaves but in the Age of Legends that wouldn't be so important. There's a reason why they made all of those angreal. It was an equalizer that enabled channelers with small inborn strength to realize her talents. Circles, so common in the Age of Legend, functioned similarly. They were headed by the most talented person among them, not the strongest

I agree completely. A skilled leader of a balanced circle with the foreknoledge of much research and time for anything that was extremely complicated. Probably also carrying any and all angreal that is needed to supply the proper amount of strength for the situation.