often error messages or verbose command outputs are big text walls with densely packed information which is hard to navigate on the stdout. redirecting it to a file and then reading that file helps as then you can format the output, separate out important parts from unimportant ones, save it for later review etc.
editors can be customized to highlight the keywords like ERROR,
FAILURE, the whole line with such words can be highlighted. you can
also grep out these words from the file. redirecting to a log file
makes life easy.