Shadow Strength should always be computed.

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Shadows.hlsl

     attenuation = SAMPLE_TEXTURE2D_SHADOW(_ShadowMap, sampler_ShadowMap, shadowCoord.xyz);
 #endif
 
-#if SHADER_HINT_NICE_QUALITY
-#endif
 
     // Shadow coords that fall out of the light frustum volume must always return attenuation 1.0
     return BEYOND_SHADOW_FAR(shadowCoord) ? 1.0 : attenuation;