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I have owned Leica digital from M8 onwards!
You touted mirrorless as an innovation. It's not an innovation, it's just become practical because of sensor power consumption and heat. Most of the innovation has come in sensors.
Mirrorless was the default and SLR's changed that for a while.
If you want to discuss it why not start with sensor microlenses and lenses that are adapted for the flat plane of sensors where earlier designs were adapted to the tiny difference in distance between the back of the lens and the colour layers of film?
Digital mirrorless Leica have not being doing for decades. Digital stuff in Leica comes predominantly from their partners.
There of course have been mirrorless before, but yet it never impacted the industry like it has in the last 15 years. Digital mirrorless + sensor density and variety is what makes mirrorless so different and innovative now.