My Anvilstrike list probably cant compete with the 2020 power creep armies any more, even with ~100 points extra from this newest GHB. It was already struggling to maintain board presence against armies like Fyreslayers and Idoneth, but now with COS/Seraphon/KO/Tzeentch there are other potent shooting armies in the mix.
Seraphon in particular are a hard counter, being able to teleport long range shooting units with Starborne, or reducing Longstrike damage to 1 with Coalesced, and reliably casting spells from outside Incantor void scroll range.
I'm not sure how to pivot the list to make it more effective. Maybe we need to swap the Longstrikes for 20x Judicator to give them more defense against mortal wounds.