hold timing fails, design
setup & hold time are limitations for a flip-flop to work normally.
They are two of a flip-flop characters.
The Max frequence is based on not only the flip-flop characters, but also the other combine logic within the data-path.
And the setup&hold time is not critical, for we could hardly to change it, unless we change the library type, such as from high-vt to low-vt.
The combine logic datapath, including device and wires, is much more critical, for we could re-new our rtl , optimize the logic, remap the cells and/or re-place & route the device/wires to met the timing slack.
And more, the max frequence is determine by the worst datapath in 1 clock domain.