Attribute changes in attack damage and attack speed do not increase the rate at which shulker bullets are fired or the damage the shulker bullets do.
Comments 5
Relate to MC-47091. Shulkers / Shulker Bullets don't even have an attackDamage or attackSpeed attribute in the first place.
Sounds intended to me, shulkers don't directly attack you, they spawn new entities that hurt you, I even think (can't check right now) that skeletons, blazes (fireballs), witches, ghasts, withers and ender dragons (fireball/dragon breath) don't use it either.
Can confirm for 16w32b.
Command used:
/summon Shulker ~ ~ ~ {Attributes:[{Name:generic.attackDamage,Base:100}]}