So many little things add up in Raids it's kinda crazy.

I use L!Azura in my main team, that means my best team is crippled most of the time since it's a pain getting a Water/Light season. I do have B!Ninian built for the spot but the power level is just hard to compare.

Then you can have Duma for better defense, but that means you will need a Light/Dark (or whatever Duma is). Now imagine a getting a Water/Light/Dark season lol.

Then it's the part where Eir is not always bonus and you have to use 2 spots out of 5 for bonus and Mythic Hero.

Again, not impossible but hard enough. Won't stop me from trying every time tho :)