Manamune/muramana buff seem a bit underturned

Since ezreal is not anymore the best adc in the game for now, this item could be finally buffed into a good item for ad caster but slapping +10Ad doesn't seem a good solution. Some champ that would love to take this item (xayah,lucian,varus,missfortune,gankplank,jayce,talon,and a wider range of diver and bruiser (illaoi/fiora maybe?)) are gated by 3 fact (in xayah case 4 because it doesn't provide any crjt). Even tho this is supposed to be a late game item (just like archangel for mage) it feel to be a mid game item (which look too much weak compared to lethality item) because it give too low ad from his mana convertion passive and the mana passive converted into bonus dmg on hit look too much useless for ad caster because it can proc only on single target ability or AA (and AD caster use a lot of AoE dmg spell. Also for being an item for AD caster for some reason it doesn't provide CDR not even into his upgraded form (and AD caster should be build around mana management and CDR) The only reason for buy this item is for Tear (except for ezreal) and stop (sometime who grab a tear doesn't even upgrade into manamune unless is full build because other item provide a better power in most of the phase of the game). They could make it a lot better.