I don't think there should be fewer modes, but fewer nodes. Loading a 6v6 quickplay should have a chance of putting you in different gamemodes like control, rift, collision, combined arms, etc.
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I apologize, I might have used the wrong term earlier. Clash, Control, and Supremacy seem to be the most popular, so prioritizing those modes while still offering some variety could be a good approach to improving the PvP experience. Overall, reducing the number of nodes to choose from seems to be the best way forward.