So by the same token, any item that gives cc or reduce MR / Armor must are mandatory, especially brine saber/ gun blade
If throwing blade was brine saber's passive then in 18 minutes of using the active the Brine Saber would essentially have payed for itself (without counting the stats)
well at least no one can say i didn't try =/
The problem with offensive consumables, or at least the ones you're conceptualizing, is that they're abilities that are previously only on champions or a select few items that have their high cost and stats to justify why they can exist.
A smoke bomb consumable is just stupid strong. It's part of the reason Graves is as strong as he is. Properly placed smoke bombs make or break ganks, skirmishes, and team fights.
We can certainly use more interesting consumables, but because they're consumables, they need to be accessible in price, and ones that provide an ability need to be balanced in whether or not it's worth a slot to hold them versus how powerful they could be early.
Given how income works in the game and the average gold a player holds on to at any one time (Rarely more than 1500-2000 at the most, as items / recipes don't tend to extend beyond that), even a powerful consumable probably wouldn't price above 500; And if the effect is strong enough, you pay 500g to win a team fight and that burden is more than likely being shifted to the Jungler or the Support, and none of them will love you for it.
It's a difficult area.