I wondered if it would be possible to cull mangrove roots as they are one of the new largest blocks in the game and are similar to leaves. the model of the mangrove roots is more complicated than leaves so I can understand if this wouldn't be possible

Looks like Minecraft is actually good at culling mangrove roots by itself anyway. (might be sodium)

Wouldn't really be effective. Mangrove roots aren't in "clumps" so nothing would actually get culled