Bill is correct. Video synths have an extra dimension that audio does not have, so they like more oscillators.
You can think of oscillator = 1D pattern. The pattern can be either animated (LFO), vertical (audio range) or horizontal. So to make a moving 2D pattern or shape, you need 3 oscillators. That’s the equivalent of a single VCO+LFO monosynth voice in audio world, like the Roland SH-101.
If you want to make more complex shapes and patterns, often oscillators work will with a second oscillator as a sub-modulator. So to make a more complex pattern voice, you need 4 to 6 oscillators. This is like the equivalent of a 2-3 VCO monosynth voice, like the Minimoog.
If you want multiple moving patterns/elements/shapes, you need multiple voices. So the video equivalent of a 6-voice polysynth like the Roland Juno-6, would have anywhere from 18-32 VCOs!!
Note that in any of the above cases, H/V ramps (like from Cortex, count as “oscillators”.) And of course you could get your LFOs and audio rate oscillators from the world of audio synthesis.