This was on Xbox. Gaming on PC is totally different! Even Cyberpunk was totally playable.
Anyway, computing shadow maps manually for two minutes when starting a level ON A PC would turn off approximately most players.
You could do a better job, perhaps, but using the GPU to render shadow maps and then flatten them to the terrain.
But then, why not just use (cascaded) shadow maps, and call it good? I tend to turn on Force No Precomputed Lighting in my world settings, and run all dynamic, and the build times are much nicer! And all shadows Just Work (tm.)