Please explain why this logic applies to the ATP but not the WTA.
When the top GUYS lose early, it's a testament to how strong the era is. But when the top GIRLS lose early, it's not.
You got some 'splainin to do.
Bit of a simplistic comparison, to say the least.
The reason the modern WTA has seeds losing early is because players' form is so unpredictable. This is because the women don't have strong serves to get them out of trouble when they are playing badly, and a lot of the top players hit very flat which means they are very hot and cold.
The reason that seeds lost early in the 90s was in large part because different players had different advantages over each other depending on the surface.