Is your mountain bike tire choice practical, aspirational, or delusional?

Practical: my tires were selected based on the type of terrain I typically ride.
Aspirational: I run tires for the terrain I want to ride, even if that means they're overkill for most of my rides.
Delusional: I run semi-slicks front and rear in the middle of the winter inflated to 40 psi.
Other.