Thanks for the time spent on the graphical answer. It's true that it's enough without Path Trace on and I could get by with a new Mac. But it's much better with PT on. I can imagine more difference in interiors with a light design with lamps on.
It's not clear to me if the latest Imac models support Twinmotion on everything except enabling Path trace..
It is very difficult to understand on Mac what is processor and graphics card. Whether they are kind to the Twinmotion or not.