Thank you for your answer. yes, I also suspect that the key point is the way the models are structured. We often have the situation that three models have the same elements in play: architecture, engineer and entrepreneur (timber construction). all three create models with very different goals. The architect coordinates the requirements, the civil engineer calculates the statics, the entrepreneur optimizes the elements in terms of logistics and efficiency. At the end, the builder would like a fourth model, as was actually built.
If the IFC models are at least modeled according to standard and structured according to a common classification, the information can be checked visually with filter.
Our biggest problem (in Switzerland and Germany) at the moment is that not everyone involved is able to manufacture IFC according to the standard. We often cannot trust our own data.
who knows, maybe these processes will be simplified in the future by new technologies. I suspect, however, that the model has to be built with a consistent structure for a long time, since the model represents the source of the data.