Focus is highly important when we need to execute. We need to narrow our view and make abstraction of the surrounding “noise” (202106172211 Focus isn’t what we do but what we don’t do) to create focus.
But this single mindness isn’t realy usefull when it comes to creativity. Creativity, generating unheard and unconvenationnal ideas require openmindness (in opposition to single-mindness). This psychological treat is called openess.