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HFSS is a full-wave solver that solves maxwell's equations with FEM techniques. Maxwell's equations are valid for all frequencies. What HFSS will not solve are quantum effects.
Are the responses of HFSS simulations in Terahertz region valid or not?
I should be noted that CST has added a frequency domain solver based on FEM and HFSS uses the TD-DGM to solve the time domain problem.
solving the dispersion media by frequency domain solver is easer than time domain solver. I think both of HFSS and CST can be used in THz regime.
I simulated Dual Dipole Antenna in Different Frequencies in THz Region with Both HFSS and CST Microwave and compared the results of these two EM Software
You should not generalize your experience/experiment too much. Accuracy with these EM tools heavily depends on the user's experience with the tool.