I know Wikipedia isn't supposed to be a textbook, but I'd argue that having a more accessible first paragraph or summary section on every topic could help all uses:
- Specialists would more easily be able to refresh their memories of topics they use infrequently before diving into the details.
- People in neighboring specialties can more easily branch out.
- Informed laypeople (e.g. experts in other industries) could more easily find new ideas for cross-pollination into their own field.
As one random example I have recently found application for an algorithm mainly reserved for use in geophysics and cartography to audio signal processing, but learning and applying it took way more research than it really should have.