Let us bait locket by making it delayed-cast
currently locket is instant cast. which means. you cannot really reasonably bait it without pretty much dying against any comp with cc. which defeats the point
divers cannot deal with locket or champions that build it + other heals or shielding items. just like redemption. locket needs to not be instant so it leaves a room for counterplay
SURE locket is a 2.5 second shield. as a melee champion. you either ENGAGE. or you don't so in that 2.5 seconds. your either in their damn melee range from the beginning to force them to use it or not use it. at that point. you lose the team fight unless they misclick
if am playing darius. or zed. or fizz. nobody is going to use the damn locket unless I go in. which at that point. I can kill nobody. the item isn't meant to 100% shutdown an entire playstyle .if it does then thats absolutely bullshit. because I want an item that shuts down an adc from mowing town my team the same way locket can shut down burst.
tldr: locket's counterplay is heavy poke comps which do not exist in league currently. they counter dive comp too heavily and has little risk + high reward.