nor am i pretending to know them all
the overarching point was just very basic; itās not always ābestā/good to chase 100% conversion on everything - also even if it might sometimes be easily available.
As for the sigil/voidspire thing, iām mentioning chaos sabo for a reason, because emberās set straight up blocks out sigil medal, so emberās chaos voidspire sabo doesnāt get sigil/100% conversion, but is still toptier FS build
and yes, as i started out saying, melee aether firestrike most definitely should get an item, because FS(and cadence) should have every 10 variants possible being āuniqueā/the fun AAs
itās because explosive strike is whatās called a secondary effect mechanic on both melee and ranged (brimstone is only secondary effect on ranged)
Secondary effects are unique in that they are wholly āseparateā from the main skill effects, thus are unaffected by modifiers and boosters applying to the main skill. So in firestrikeās case a conversion mod, ex 100% phys to aether, would not apply to explosive strike, it would have to be global conversion.
*the list is not 100% correct anymore as some stuff like Blood Burst has changed (stuff like brimstone/vile eruption also isntā ālistedā but mentioned in the writedown)