If the CT and Mhach raids were properly scaled, they'd both play closer to and take as much time as the Ivalice and Twelve raids. I played both series as current content and the current takes are both broken messes.

I think the complaints about the Alex raids being so common is less prevalent is simply because they're fast. The devs have mentioned years ago that they considered making Eden MSQ, meaning they want to use Gaia. It'll turn the 8-man series into an Eden farm just the same.