If the output of a git command was raw text sent to stdout, like cat, then I would argue that escape sequences should be ignored and passed through unmolested.

If the output of a git command was raw text sent to stdout, like cat, then I would argue that escape sequences should be ignored and passed through unmolested. But the output of git tools is colored (if enabled) using terminal escape sequences. Given that, the output should fully comply with the appropriate terminal escape sequences and should filter the ones the author has discovered.