I don’t see point for wasting time on such as my method for testing machine ridigity tells me in few seconds the difference between machines side by side. My testing method does not include ”vice” or similar to cause permanent damage to the machine.
Again, I see no point for wasting time on such and trying to unsee some obvious things about machine I could see in few seconds test already.
So something that feels flimsy and flexible for me would magically in couple weeks use suddenly became rigid?
Not sure I follow your logic but I know that thing that initially bug me, only bug me even more after a short while.