Every type of camera has its own advantages and should be used for those applications where it is best fit.
I disagree.
Following this logic, a camera company should spend R&D money on every conceivable "level" of camera, possible for the human imagination.
Nonsense.
Remember another truism, "
A confused mind says, 'No.'"
Having an infinity of levels wastes time, resources, as well as bulk markets.
As such, here should only be 3 (at most, 5) "types" of DSLR.
Beginner, Intermediate, Pro. (Action)
Intermediate, Pro. (Landscape.)
That's it. Cell phones can do the rest.
Likely, mirrorless will ultimately replace all landscape DSLRs.
Not so sure about action.