viewThreadSafe/threadSafe unused?

There is the grid capabilities viewThreadSafe/threadSafe but they don't seem to be specialized for any grid manager. Does that mean none of the managers are thread safe or has this just been overlooked?

I know people are using multithreaded grid traversals (and I have been using it without problem for YaspGrid and ALUGrid), so does everyone just rely on luck that it works or is there a mechanism to know more that I'm missing?