Ideally yes. But there are two major differences between a local and a remote call:

1) A remote call – inherently – fail. However, some local calls never fail. Either because they are designed to never fail or because you have done the required checks before executing the call. A remote call can fail because the network is unreliable and there is no way around that (?).

2) A remote call – inherently – can be very slow. Again because of the unpredictable network. A local call may be slow as well but usually either because everything is slow or because it just takes a while.

So if you have a call that may or may not be local you still have to treat it like a remote call. Right?

I think having a certain set of calls that may or may not be executed locally is not that bad. Usually it will just be a handful of methods/functions that should get this "function x(executeLocally = false|true)" treatment - which is prob. an acceptable tradeoff.