Does the interface

INBTSerializable<T extends NBTBase>

obsoletes

Entity#readFromNBT

and

Entity#writeToNBT?

Ok, so just to see if I understood you correctly, we no longer need to implement

readFromNBT

and

writeToNBT

, as long as we implement INBTSerializable?

When you extend a vanilla class, you need to override the vanilla NBT methods. When you create your own class that can be written to NBT, just implement

INBTSerializable

.

...which will then probably make you write

writeToNBT

and

readFromNBT

methods.

 

(Protip: an interface never lets you avoid implementing something)

For calling: Yes.

INBTSerializable is just a way to interact with different kinds of serializable things (TEs, Entities, ItemStacks, etc. etc.) through one interface.

this is the exact reason it was made, to allow you to serialize ANYTHING with a single interface instead of having to specialcase every type of item.