On reflection, I dont think thst giving all functions to the strata manager is Carter blanche.
The act allows the functions of the chair, secretary and treasurer to be assigned to the strata manager. But the act is very specific of the functions of these positions and no way does it say any function has decision making power for the OC.
The act allows the appointment by the court of a compulsory strata manager. Under thst delegation , the strata manager has full functional control as well as full decision making control. Note thst this is court determined.
I believe that if there is no committee, then the decisions of the OC must be made at a general meeting. ( the intent of the committee by the legislators is so thst a small group can make decisions for the whole group).
So in the posters case, ANY decision must be put to all owners at a general meeting. The decisions can’t be made by the strata manager as the act only allows this where a compulsory strata manager is appointed.