"Morello gives everything mages need so we gonna rework it"

gives what every fighter needs : HP / CDR / Armor pen / AD / Movement speed buff gives what any marksman need : guaranteed crit / movement speed buff / AD / attack speed gives what any assassin need : burst damage / lethality / AD / CDR / deletting ward and remaining invisible

Yep but let's turn Morello into a garbage item costing 3000 golds and not having any mana source anymore aside of (first one isn't, it just gives "mana", second one needs to be stacked and is only bought by a few champions)

Meanwhile most AD casters don't even care about mana or have an item making them not care about mana anymore : or have such low mana cost that they don't even need to watch out for their mana pool, or simply don't have mana LUL

Riot's favoritism at its finest