What’s the point? Any mastering operative software is a multitrack daw by definition. Wavelab is a multirack in concept, but with kind of Appleish crazy logic behind actually forcing and limiting operator to a “view”. I’m thinking to crazy things like last iPad Pro with stellar features, premium prices and software inhibited data transfer on the usbc connector… 
Why a platform intended for professional use shouldn’t evolve at the 10th release to what professionals need? If with the term “multitrack” you are referring to midi score and vst instruments i agree. But basic routing is at least a 20 years old feature of any pro mastering software. Limited functions are found in toys like Ozone etc. If the product line includes a LE version and a Pro version in my opinion Pro should be pro.