But from Panasonic's perspective, the company manufactures many MFT lenses and most if not all of them would not cover the EVA1 sensor. So this is problematic for the less technically-minded clients out there. It might not be an issue for you but it's a huge issue for a manufacturer such as Panasonic.
So what? This is a trivial problem to solve, and not a worthy excuse at all to for Panasonic to try and give.
Because all of Panasonics MFT lenses are electronic lenses, they can easily have the lens data there to recognise when it is mounted on a Panasonic EVA1 MFT and scale it by default (although would be nice to have an option buried deep into the menus, for this action to be turned off) to a 4K cut of the 5.7K sensor (which would match the MFT sensor the MFT lenses are designed for). So to have a 4K cut of the sensor... yup, that is plenty enough for many of our needs!