[DAC-question]: The cost of having dynamic `version_rpc_arg`

The following discussion from !8554 (closed) should be addressed:

• @andrea.cerone started a discussion: (+3 comments)

  is the check on the api version and legacy mode be necessary here?

  If you only register V0 endpoints for the legacy mode, then this should be implicit. It would also avoid having the notion of API version spill to the signature manager

See the response in the referenced thread. This should definitely be discussed in more detail! TODO elaborate.