Currently, to import ArchiCAD models to SYNCHRO 4D (or any other iTwin-based service), users must use IFC connector. However IFC connector has multiple issues.
Laing'O'Rouke requests creating an ArchiCAD dedicated iTwin connector:
"our entire bid team BIM users work mainly with ArchiCAD and to be honest IFC format is not very good with Synchro. A Synchro connector designed for ArchiCAD would greatly improve our 4D workflow"
Laing'O'Rouke has 35 SYNCHRO 4D Users in UK only.