Before the Unified Lighting Beta, we were able to set the ShadowSoftness if the technology was ShadowMap or Future.
But now the ShadowSoftness property is only visible if the LightingStyle is set to Realistic.
Hey, sorry if there was any confusion in the post.
In the thread I failed to highlight that “ShadowSoftness” does not appear with “PrioritizeLightingQuality” enabled along with the “Soft” Lighting Style. (ShadowMap)
With this, the “ShadowSoftness” property is not accessible via the Properties panel - but it is still modifiable via a script. You can also see visual changes to shadows as @trigophi mentioned.
Which makes it seem like the property was forgotten to be implemented.
Made this video showing ShadowSoftness being modifiable and displaying visual changes with PrioritizeLightingQuality Enabled & Soft Lighting Style