This is going a bit into the weeds but why not. One very big reason the MQB platform can handle so many models is that it does not include the engine, it just standardizes the engine mounts. The VW group uses a large variety of engines. The current one’s in use range from 3, 4, 5, 6, 8, 10, 12, and 16 cylinders, with each category having several variations. There are about 20 variants of the 4 and 6 cylinder engines alone. List of Volkswagen Group petrol engines - Wikipedia
ICE models are largely differentiated by their engines as evidenced by the wide variety of engines made. This isn’t the case with BEVs. There is no equivalent in BEVs, except perhaps for the battery today and it seems unlikely that future batteries will need to be made in anything approaching the same number of variations as ICE engines.
To sum up, cars with different ICE engines differ significantly in performance. That’s the basis for all those ICE models. In contrast, OEMs are moving to using a small number of electric drive train platforms. Cars using the same electric drive train perform similarly, unless they have different software.
To sum the sum up, BEVs may end up looking different externally, but differences in hardware performance will decline as batteries and electric motors become standardized. This homogenization of performance will be accelerated with the evolution of autonomous driving software.
Standardization of electric hardware means that the primary differentiator of BEV driving performance will be the software. Brands and models will be distinguished by their software and the exterior/interior decor. In effect, the same socks but with color determined by software. My bias is that if/when self-driving happens folks will care more about interior comfort and functionality than how the vehicle looks. Interior space is optimized with the box shape, hence the box on wheels will dominate the autonomous driving future.