Why are pinocoderm and choanoderm in sponges not considered as tissues?

Pinacoderm and choanoderm in sponges are not considered true tissues because they lack the level of organization and specialization found in true tissues. The pinacoderm serves as a protective outer layer, while the choanoderm consists of flagellated cells that aid in water circulation and feeding, but both layers are not composed of tightly bound cells with defined functions. Instead, they retain a more simple, cellular organization characteristic of the primitive body plan of sponges, which do not have the complex tissue structures seen in more advanced animals.