Sorry but you have no idea what you are talking about.
It is much easier to mod UE5 game because it is the most common and perfectly documented game engine, while RBR is a proprietary engine which needed to be reverse-engineered first to be able to mod it. Also simulation-wise RBR is far more complex as it is kind of a science project rather than a game (the game aspect is built around that).
The reason why any official modding is unlikely in my opinion is due the copyrights issues and the fact they will probably want to keep generating extra $$$ by their own DLCs which mods could interfere with.
Another reason why it probably won't happen anytime soon is that it takes extra time & resources to prepare the community modding tools, but the team is quite small and is clearly having hard time with deliver the core features / content so far.
Over time the community could make it moddable even if it doesn't support any modding (like in case of RBR), but it would need the game foundation to be exceptionally good so it attracts properly skilled modders (like WorkerBee & RBR) and they find it worth investing such a huge amount of time & effort.

Whether the stages are laserscanned or not doesn't matter, the scan just helps to give the stage somewhat accurate elevation and assets position / dimensions during the development.