Proverbs warns about being simple-minded. "How long, O naive ones, will you love being simple-minded?" (1:22) The simple should become wise rather than remaining simple (Psalm 19:7).
Despite all of the advantages people in modern cultures have in intellectual contexts - higher literacy rates, more widespread formal education, better technology that includes more access to information, more political freedoms, etc. - it's common for people to not only be too simple in their thinking, but to even treat it as something virtuous and respectable. Supposedly, it's good that they're such simple people who don't learn much about a subject or mature in other ways.
Jesus told us that having more makes you responsible for more (Luke 12:48). Given the intellectual advantages we have in contexts like the United States, we should have much more to show for those advantages than we do.
Be careful not to encourage simplicity where you shouldn't. The immaturity of your children, people in your church, or people in YouTube threads, for example, should be discouraged rather than encouraged. They should be held to a higher rather than lower standard and should be expected to mature over time. That includes maturing intellectually and becoming more active in disseminating information rather than perpetually looking for other people to provide the information.
