Because they are shallow layers over their REST API? There's nothing useful in there anyway.
I'm surprised this hasn't been trivialized/automated away yet (or has it?) Some sort of language-neutral REST-protocol description language, that could be used to code-generate client libraries and also generate a test spec and documentation. Or maybe just a standard for media-types in HATEOS response types in specifying REST API "roots", to make them machine-discoverable, in a way where the result could be "cached i…
I feel like abstracting APIs into objects (essentially RPC calls?) creates too much of a dependency on the network. The friction of writing the calls and their handlers helps minimize their use :)