Why do you need to update the data in wineserver and not in the client?
The problem is that the timer updates need to be extremely precise, or they are worse than useless. So we can either do that in every wine process, or do it once in wineserver and share the memory.
On Windows, the kernel shares this memory with all applications for this exact reason.
Consider each wineserver call just an RPC, and leave it alone, server doesn't run anything in the background, and can't magically update timers behind the client's back.
I certainly agree that wineserver doesn't do this currently, but the Windows kernel does, and there's no reason why wineserver can't.