(1) How important is to upgrade routerboard firmware,
(2) Is firmware changelog being updated,
(3) Why when updating there is not a option to also upgrade the firmware in one process rather than having to update firmware separately,
Your router board will still work with a not up to date firmware. You might miss improvement’s.
Sometimes
One point of failure makes life easier. If you update two more points at the same time you won’t know which is causing or interacting is the problem.