So right now my game doesn't use textures at all, only vertex colors. However many things would benefit greatly from texturing (e.g. vegetation, clothing). Adding textures means

1. Higher engine complexity
2. Much higher content creation cost

(2) is my major concern.

Anybody got any opinions/advice on this?

@lisyarus If your target platform can handle it then triplanar mapping can be an alternative that could make content creation cost lower, if it fits.
@lisyarus Otherwise stylished shaders is a good way to go too. Basically embrace a style that you CAN do easily, or work very hard to get to the style you actually want. If you are lucky then the style you want is easy to do :)
@breakin It easily can, but it doesn't fit at all, unfortunately. A triplanar mapped barrel or hat would look a bit weird :)
@lisyarus Embrace weird! Just gotta find your weird.