On the back of some US Jepp. 10-9 pages, even when no SID is published, there can be IFR/IMC climb/turn restrictions. For example, La Crosse (LSE), Birmingham (BHM), Harrisburg (MDT) etc.
In general, if a pilot is fortunate enough to have a high ceiling and good visibility, climbing only OVER lights on the ground might keep you safe near high hills, if you are at the Min. Safe Altitude (MSA) or higher for 25 miles or less then at a safe enroute altitude.
Descending near Albequerque, Bozeman, Las Vegas can be much safer if we state to the other pilot that we will remain over valley lights, especially on a sudden, unexpected go-around when LAS Approach Control
descends to slam a very fast 737 in front of you.