In order to get the best out of a landscape image you capture in digital photography, you will need a blend of highlights, midtones, shadows and many other aspects. This is in addition to the exposure of zones. Such blend will definitely add considerable amount of details to the image. However, as of today, modern sensors have become really advanced to capture more and more details. If you set your ISO settings to a lower value, you can get more details easily.
When it comes to highlights though, you can capture relatively less detail. So, if you don’t use a graduated ND filter, the best way to capture more details is to underexpose it. Such approach will let you capture more details in the highlights. During the post production process, you can play with the shadows and emphasize more details.
As long as you have less contrast in the image, you can get better results. However, if you have a graduated ND filter, you can obviously go for more details.
In addition to that, you can consider taking two images (one with highlights and the other with shadows) and create a single HDR image.