When devour got transferred to void 3.0, bungie removed the ability for you to eat your grenade to proc devour, saying that it would clash with chaos accelerant. This heavily damaged devour in PvP as procing it now is much more difficult and you no longer have control over when it happens.
Why not make it so chaos accelerant takes priority over feed the void, it wouldn't adversely affect anything else in the game
For example, if you ran only feed the void, then you could eat your grenade, but if you ran both feed the void and chaos accelerant then you would charge your grenade instead.
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The new warlock boots does exactly what eating a grenade does. It instantly grants devour on activation, pair that with a damage rift as intended and not only did you just proc devour but you are now dealing 20% more damage inside the rift. We don’t need to eat our grenades anymore, the boots are miles better