Because advanced tech will only garner so much. I enjoy better color, better skin tones, better glass, better ergonomics, better software/menus, better customer care and weather sealing. It's a total package which transcends DR.
I know this is a big generalization, but I think you can categorize the Sony fans and switchers as being mostly gear-heads. They refer to "new tech" or the "latest tech" as if cameras were a new technology that is evolving quickly. In reality, there has been virtually no difference in the last 2 or 3 generation of anyone's cameras in terms of IQ - and only minor slow changes in other areas. But gear-heads are interested in having the latest - almost a need to have the latest. Whether they actually believe that the latest tech will be visible in their photography, I can't say. Whether they are most interested in boasting to others who don't have the latest is also a possibility, in my opinion.
The other non gear-head group (probably a minority on internet forums from what I can tell) would be mostly interested in exactly the things you mention. They don't compare specs from the various brands, they look at what is most important to them. They interpret value - not as which camera has the most specs, but the overall quality of the product. The first group looks at Sony and constantly says, " I get more value for the price." I would respond that having better color is not an additional spec item, but is more important. All cameras have ergonomics, so it's even on the spec sheet, but clearly not even in practice. The same for the other items you mention.
I think camera companies are not too concerned with switchers. They make a lot of noise on forums, but camera companies are more interested in serious photographers. People who are in it for the long haul. People who aren't looking for a tech gadget, but a tool as part of their photo equipment. And that means lenses - which you can use for a lifetime, where the camera's lifespan is probably 7-10 at the most.
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