It would add to safer driving to have speed limit changes show up as standard indicators on the map while driving, meaning seeing them approach just like any other indicator on the map.

Current issues/reasons:
1. In South Africa we have many areas where the speed limit road signs are missing. I count four that are missing on my daily route alone, and this is extremely dangerous with frequent sudden braking necessary immediately after realizing the speed limit has changed without prior notice.
2. There are often speed cameras directly after a speed limit change, which is a nice little dirty trick used by our often-corrupt traffic department officers, with lots of easy to find dashcam footage online to attest to just this one issue.
3. Better preparation for speed transitions - Advanced warning allows drivers to gradually adjust speed rather than making abrupt changes, which reduces the risk of rear-end collisions from following vehicles.
4. Unfamiliar route safety - When driving in new areas, drivers may not know local speed limit patterns and could easily miss changes, especially when traffic signs are missing. This is especially important for tourists or business travelers.
5. Night driving visibility - Speed limit signs can be harder to spot in low-light conditions, while the navigation display remains clearly visible.
6. Weather-related visibility - During rain, fog, or other weather conditions that reduce visibility, physical signs may be obscured while the digital display remains clear.
7. Standardized information - Eliminates confusion from damaged, faded, or vandalized speed limit signs that may be difficult to read accurately. Additionally, it is much easier to follow the navigation map when speed limit information is displayed in the familiar indicator format that drivers are already accustomed to using.

This has previously been suggested very long ago (https://waze.uservoice.com/forums/59223-waze-suggestion-box/suggestions/10519629-speed-limit-indication-on-map), but without much motivation given. The response of the Waze Team was not helpful, as the issues were not addressed. Since this is a safety issue more than a nice-to-have feature (at least in my country), I believe it requires more attention from the developers.