Maintenance for the week of October 5:
• [COMPLETE] ESO Store and Account System for maintenance – October 8, 8:00AM EDT (12:00 UTC) – 12:00PM EDT (16:00 UTC)
Theoretically you could still do it but since Staves now count as 2 set pieces and the increased Light Attack damage since Summerset there is really no reason to not use Inferno Staves.