I have read from here https://forum.openwrt.org/t/upgrade-all-packages-for-cli/57658/8, against doing a blanket upgrade. In 'regular' OS, this is OK. But not with Openwrt. How is one to know what and when to upgrade. The idea has been an upgraded package/system is more secured, less bug, etc. So, if it is not advisable to do a complete system upgrade, then what options are there to always have running a system with those benefits, security, patched bugs, etc.