I think the biggest problem is the lack of APIs provided by the Slicer. If the slicer provided a comprehensive set of API’s then it would be possible to write blender addin’s to tightly integrate the two products.
The recent enhancement of Bambu Studio to automatically colour based on the materials in obj files is a start, plus it is possible to import Gcode into blender and render the sliced print. - see this thread. Blender Multicolour BambuStudio Gcode Importer
Another issue is that the Blender interface has a fairly steep learning curve - so if the main interface to the slicer was via Blender then I don’t think it would be popular with most casual users.