What kind of limited functionality you have encountered with it? I can run ArchiCAD 14 with Mac OS Sierra 10.12.6. That's why I would believe you could run AC16 too with Sierra.
But then again, I have not tested it thoroughly. I'm not using it actively, it just was there as an old installation in my iMac, so I tried it.
AC25, Rhino6/7+Grasshopper, TwinMotion • Mac Pro 6,1 E5-1650v2-3,5GHz/128GB/eGPU:6800XT/11.6.5 • HP Z4/Xeon W-2195/256GB/RX6800XT/W10ProWS