Hmm, nope.
Book 4
sees Egwene with Rand, Mat, and Moiraine in the Aiel Waste, where Rand learns the Aiel history while Egwene especially and Moiraine to a lesser extent start being trained ('put upon' perhaps?) by the Aiel Wise Women. But there's three other groups of characters with three other plotlines; Perrin in the Two Rivers gets just as much time, as does Nynaeve and Elaine in Tanchico. Min at Tar Valon gets less page time overall, but still makes up a solid chunk of story
Book 5
Continues with the same character setups. Perrin and the Two Rivers plot is absent entirely, but Min and company get a lot more 'screentime' to go with Rand & Company and Nynaeve & Company.
And yeah, there's a bunch of brand-new characters, but that's part of The Wheel of Time - there's an absolutely incredible number of named characters of varying importance, and expecting Jordan to not introduce a whole bunch more considering where the story goes in Book 4 is rather silly.
Hmm.
"Detail for the sake of detail." Aka world-building.
You can build a world without going into ponderous and unnecessary descriptions of every little aspect of that world.
Sanderson understands that and has demonstrated it with his own original works, whereas Robert Jordan didn't.