Raid SRs are basically pegged to be roughly just below the average level of a gacha SR, though with some variance (Gabriel/Balor/Atalante hitting above, Baldr/Fortuna hitting below). That does mean that powercreep applies to them too, as 'average level' shifts upward. Gryla's not bad at all for a thunder SR. Manes and Attal also aren't shabby for those who don't have much in their respective elements. I also like Phoebe, because I think that being an Attack type with access to a heal/barrier (even if it's single target only) is a neat idea. Though it is true that we don't actually care about character type in the present.