Perhaps to inform people about the goods and services that you offer that they might be interested in buying?
There's plenty of people that don't know how to properly use a search engine, hell there's plenty who don't know what a search engine is.
Plus, search engines have a role in the consumer decision journey, but don't fulfill all the roles.
Just to add up, with SEM (paid ads + SEO) search results have a big chance of being biased nowadays, and you should always take that into consideration.
You're right haha, plus I'm more of a minimalist so I just want to have less stuff in general.