I only know this from the architect. As a wall planner with a column for each working day and a row for each involved craftsman. Otherwise, construction management is hardly feasible if you handle the construction with individual craftsmen or if you have to incorporate them - logically, the roofer must come later if the carpenter is not on schedule. With a general contractor, the architect does not need this to that extent, and neither does the expert (who, after all, is not responsible if scheduling avalanches occur). From the scheduling, you can only see who should come when. The base waterproofing specialist sees from the detailed drawing where and how far he has to extend a waterproofing for the terrace door installer. They do not need to run around simultaneously and get in each other’s way. But if, for example, she had such wishes ("A must pay attention to XYZ because of B"), she can actively formulate them. For this, the general contractor, if he has everything sufficiently in his head or feeling, does not need to draw a colorful table. And the architect does not need to either if he has a general contractor.