Egwene had to fend off fireballs and lightning too. She merely ignored the shields because they bounced off her. The sul'dam made it quite clear that they were happy for the marath'damane to be captured or killed, with a preference for capture. The fact that 20 Aes Sedai died in the battle is proof of their less than benign intentions.

It depends on how you look at the battle, and you look at it very negatively. Galgan himself said that there were hundreds of damane to capture, so clearly they were expecting a bigger quarry than Tylee could even deliver. The Seanchan killed 20 Aes Sedai and I'd be very surprised if they captured as many. That leaves the White Tower standing, with hundreds of functional Aes Sedai and a thousand novices in a united system. I don't care if some Sisters are devastated because the Tower was finally damaged in a battle, the numbers speak heavily against the Seanchan.

Egwene couldn't even channel after the battle she was so exhausted. We personally saw her kill two sul'dam, and she describes killing many others - she may have killed half the damane for all we know. Several sul'dam and damane have been captured too. Egwene also tried to kill captured Aes Sedai before they could be taken away by the to'raken, so the Seanchan quarry is even less.

I don't deny that Egwene was supremely powerful in this battle - she wasn't only using a sa'angreal, she was also in a circle with the novices, maybe up to thirteen. I'm merely saying that she faced off a force that equalled her power. Maybe they didn't have the ability to shield her, but they definitely stepped up the pace at trying to kill her when they realized it.

You need to look at both sides of the equation. If Rand has Callandor, he's not vastly superior in any situation. What happens if he's facing a hundred Ash'aman?