Deep Shadow Map are best for spot lights. For distant lights DSM produce very soft shadows.
Therefore I use Ray Trace for distant lights to give sharp shadows.

I know RT is slower than DSM therefore I have only one distant light with shadow turned on. All other distant lights are just to get more illumination.

You don't have to turn shadows on for every light. If I have a mixture of spot lights and distant lights I have to decide which lights to give me the desired shadow.  All the other lights have shadows turned off, they are there for illumination only.

I see some renders by others with outdoor scene where their figures have multiple ground shadows. I don't know about you but when I last checked we only have one sun and it produces only one shadow of me. LOL.