Hi Sander,
Perhaps, as processor power increases, and the cost of RAM comes down, a user could enable/disable RTP on a process by process basis, and specify whether the RTP whould be at full 1:1 resolution, or otherwise?
There would certainly be a few processes that happen 'quickly enough' that RTP could be a legitimate option EVERY TIME a parameter is changed in a process dialogue GUI - and, again, if the user is empowered to control this, then the overall flexibility of PI increases yet again.