Seriously, when a tiny camera and couple of lenses can cost as much as a house in some places and if there are design flaws in that system it would change your opinion.
There is no such thing as perfection. There are however a few suppliers of photographic equipment that seem to do their best to deliver according to the wishes and needs of their customers. The M-D and also the GH5s are cameras that result from such a product philisophy. They are not cameras for the masses, and their flaws are plentiful. Still, they satisfy important practical and/or emotional needs for a few, dedicated users.
Maybe my fascination for these cameras is flawed as well, or maybe I like them because the challenge is as important to me as the photograph. It's all a personal choice, or at least it is form me. I find rangefinder cameras awkward to use, and one without an LCD where I could have checked the results, even more awkward. So it's an interesting challenge. As is taking photos with a 10MP camera in 2018, a year where photographers use cameras with so high resolution that they can see what kind of polyester the artificial eyelashes of the model are made of. Some take good photos as well of course, not least members of this forum, but sometimes I think that nah... this is too easy. The D810 was in a way too easy (and at the time too expensive), the results to perfect.
If my livelihood depended on income from my photos, just like going to work or to the airport makes me dependent on a reliable car (I drive a Toyota Corolla nowadays), I would obviously use a D850 or a 5D or A7. But I don't. To quote a British motor journalist, that guy with a long beard... (is he around anymore?) who didn't fancy Japanese cars: "I wouldn't be seen alive in one of those, so if you spot me in a Nissan, you know I'm dead.". I used to look at cars that way, now it's the way I look at cameras... my cameras.
So I would like to have a GH5s (or an M-D), to satisfy my ego, and maybe now and then, when somebody approaches me and asks "What kind of camera is that?" and "Ah... a Lumix (which he had never heard about anyway), they are good aren't they? How many megapixels?", and I say 10, he goes quiet for a while, until he stutters "I thought they were much more nowadays. My phone has 20, you know, an my uncle has a Canon with more than 50, but that's a professional camera with many lenses and all...". Then, that's when I know that $2,500 was well invested. That's me :ROTFL: