Articulated screens are useful, but they involve trade-offs that matter more on pro bodies. Their main advantages are easier framing from awkward angles, better usability for Live View and video, and in some designs the ability to fold the screen inward for protection.

The main downside is durability: a flip-out screen adds a hinge and extra moving parts, which creates a potential weak point compared with a fixed LCD. It can also add some bulk and may be more vulnerable to knocks, wear, or damage.

Another reason is that many photographers using high-end cameras still prefer the optical/electronic viewfinder for shooting stills, so the rear screen is less critical during capture. For video users, external monitors are also a common option on higher-end setups.

There are practical considerations too: using Live View or the rear screen more often can increase battery use.

So the reason articulated displays are not universal is not that they lack value—it’s that manufacturers have to balance flexibility and video convenience against robustness, size, and the priorities of photographers who mainly use the viewfinder.