Yes—Saturation is still useful. In general, Vibrance is better when you want a safer, more selective boost to less-saturated colors while avoiding harsh skin tones and clipping. But Saturation can be preferable when you want a global change that preserves the image’s existing relative color relationships.

Good uses for Saturation:

• Boosting overall color evenly, such as adding life to a flat or cloudy scene.
• Keeping the original color contrast between colors rather than having Lightroom “balance” them.
• Creating muted looks by lowering saturation; negative Saturation often gives a pleasing subdued palette, while negative Vibrance can look odd.

You can also combine them creatively:

• Raise Vibrance, then reduce Saturation slightly to normalize the result.
• Lower Vibrance and raise Saturation for a selective-desaturation style, where a few colors stay strong and others move toward gray.

In practice: use Vibrance first for natural-looking color, then use Saturation when you want a more uniform global adjustment or a deliberate stylized effect.