I believe there are two parts to this argument: 1. articles should start with a brief summary of their context, arguments and conclusions. 2. articles should

I believe there are two parts to this argument: 1. articles should start with a brief summary of their context, arguments and conclusions. 2. articles should explain their terminology. The first point I agree with (and believe most do). But the second point is arbitrary, and in my personal opinion, the linked article is fine in this regard (anyone familiar with X-Windows should be familiar with Wayland as a concept, and every single article related to Wayland cannot be expected to explain core abstractions like compositors).