Deep research and finding EVERYTHING on a topic is the only reason to do it. Here's what I like to do when researching a company: if you want to find everything they said about THEMSELVES (usually good things) search inurl
epsi.com (for pepsi as an example) and you'll come up with every page they put out about themselves. If you want to find out the bad search "pepsi" -inurl
epsi.com. This takes a little more time, but it will find every instance of the word pepsi that is not on their actual site. Try it!