Aslakh.3072

Thats easy to explain, weapon swap sigils exist. Using energy sigils is a really good increase to the ability to use ambush attacks. I find I get better damage with energy sigils than a swap to axe/torch due to staff ambush being an amazing might generator. Another example is on condition necromancer, especially reaper. Back before scourge it was really nice running hydromancy/geomancy sigils in scepter/dagger x scepter/dagger for a aoe 6 bleed 10 second cooldown attack that was way better than swapping to staff.

They still work as well as they always did. As someone running the staff/staff trailblazer variant the only real change is the nerf to nightmare/trapper meaning you need to switch to renegade or undead for viper/trailblazer respectively. Torment runes are potentially a large boost to survivability without losing damage but I havent spent the ~50 gold on them yet to see if they will change.