For example, characteristic combination found [here](https://eurocodes.jrc.ec.europa.eu/doc/WS2008/EN1994_3_Hanswille.pdf):

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

It can be seen that the dead loads $G\_k$ are taken as the characteristic values instead of multiplying them by some factors of safety as in the case of ultimate limit states. Why are loads serviceability limit states taken as characteristic values instead of applying partial safety factors into their values?