Seems to me that this "obvious solution" has exactly the same problem as the original one... "it would only take ONE civilization breaking this trend to be visible".
It's possible that exotic physics/computation offers such ridiculous benefits relative to interacting with normal matter AND that its discovery is very obvious along all lines on the way to tech that colonizes normal matter star systems that all civilizations escape into it.
This thread is intended to provide a space for 'crazy' ideas. Ideas that spontaneously come to mind (and feel great), ideas you long wanted to tell but never found the place and time for and also for ideas you think should be obvious and simple - but nobody ever mentions them.
This thread itself is such an idea. Or rather the tangent of such an idea which I post below as a seed for this thread.
Rules for this thread:
If this should become a regular thread I suggest the following :