Ezreal's main reason for buying Manamune isn't going anywhere though.
it's mostly his passive and W being changed with a visual update. Not a ground-up rework.
That said with Urgot no longer buying Manamune and Kaisa's interaction with it nerfed, the active removed because toggles are bad gameplay apparently, it really does need an upgrade.
level 18 Ezreal with manaflow band gets a whole 84 AD from Muramana, and zero CDR, while Death's Dance exists and doesn't take a fraction as long to become useful.
I'm aware Muramana isn't used for its statline but taking power out of a passive to make the item more useful overall is just healthier gameplay