Semantic Layer! Major features missing: dynamic parameters, enforced parameters upon field selection, dynamic SQL generation (using params)

This is THE major, glaring hole in this product. The ability to create a beautiful, bullet-proof semantic layer for each subject area that can be commonly used by all users with a need for reporting is essential and MUCH easier to maintain and insures that all reporting in the same area is consistent. Having to update multiple datasets if a business rule is changed is one of my major complaints with the structure of Power BI. Please implement the reusable semantic layer concept.