In 1916, during the First World War, the Germans dropped the idea of using the pickelhaube because it wasn't practical in the trenches. I read the [wiki](https://en.wikipedia.org/wiki/Pickelhaube), but I am left with one question: 

It remained in service for more than 70 years, it doesn't seem to be practical at all and its additional combat value looks negligible. *Did it have any real practical use?*

[![enter image description here](https://i.stack.imgur.com/gPOyP.png)](https://i.stack.imgur.com/gPOyP.png)

[Source: Dr Max Litthauer’s pickelhaube (spiked helmet) with camouflage covering, 1914–1918. Donated by Bart Ullstein © Jewish Museum Berlin]