PREFACE: I beat E6-E8 normal on first attempt today. So the canned response of "you can't beat it get gud" does not apply to my complaint here. You can beat something and think it's overtuned; not mutually exclusive.
After beating these as a first timer today, I believe Eden 6-8 are way overtuned for normal and this seems to be an overcorrection from people complaining Alexander normals were too easy. E6-8 normals have savage tier mechanics that are not justified in my opinion, such as 0KO quick sliding and mechanics with no time to react unless you know what the mechanic does before you entered the instance and before your first attempt. As a contrast, I think Alphascape properly did normals vs savage such as the snake boss where normal had guardrails for positioning while savage removed those guardrails (so you could slide off). In contrast, E8 Shiva normal has no guardrails plus many mechanics that are virtually insta-cast.
E6-E8 is way too much of an overcorrection to people complaining normals are too easy. Alphascape got it right. SE has to dial back normal raids moving forward.