No, Adloqium is easily as good as stoneskin and in many regards is a far stronger spell (quicker cast, effective on soft targets, heal component) whilst in combat and only really loses out in the annoyance of trying to precast it for a pull.
Fey Covenant
It's pretty clear that virus chains were too strong, doing this would just line another ability up on the chopping block. No thanks!
Why the worry about stoneskin as Sch? The cast is slow enough that you'll struggle to get both stacked up mid encounter without one getting wiped off in the process, beyond simply prebuffing for an encounter theres very little reason to want to cast it. It's a whm ability for the same reason that Sch have Whispering Dawn.