[la_barba]

You forgot one qualifier, the most expensive -professional- cameras. Different professionals have different needs. Every camera is designed with a usecase in mind. Off the top of my head professionals photographers need:

* rugged tank-like construction - 1D, 5D series mag-alloy bodies check, weather sealing - check

* reliable AF - check

* awesome battery life - check

* professional support services that can service/repair/loan products with a super-fast turnaround time for when you have a gig.. - check

* high quality optics - Canon L glass, check

* high res sensor for billboards - 5DSR check

* huge library of lenses - check, check and check

In all of those things Canon and Nikon (and even Sony to some extent) excel. I don't think the features you want are useless or provide no value, but you have to look at the bigger picture and take the entire market into consideration. People are using smartphones not just because DSLRs don't have certain features, its that they don't want to carry yet another device when their smartphone does an adequate job.