You are correct Safety Concerns. ACARS is a 'messaging system' only. And yet you restrict your comment to data it provides. You can't have it both ways. You say essentially that ACARS is quite fallible, then you infer that because it doesn't report more, conjecture isn't based in 'evidence', which is it, then? Is it dependable? Does it preclude entertaining things it doesn't 'report', Or is it not telling us the whole (or even major) story because it is only a 'messaging system'?
What I am saying to be clear is that acars is just a relayer of information. The information will go out as and when available or as customer programmed. What it wont do is behave in an extremely selective manner to assist speculative theories just because the VS has been found.
It is simple really no magic. Had the VS caused this accident there would be 1001 more messages. Those messages arent there. All systems send their messages to a central point which then transmits them.
ACARS has nothing to do with anything except that it has assisted this investigation by doing its job and transmitting messages it had absolutely nothing to do with as far as collecting them or producing them is concerned.