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by drawk 3888 days ago
My understanding is that low settings used to make stealth units easer to see in SC2 (and heroes of the storm, which is on the SC2 engine). Supposedly they've patched it in newer versions, but I'm sure people who've logged a ton of hours in low modes still prefer it.

In HotS some of the ability effects show through the fog of war, and supposedly that's easier to spot on low settings still. It also reduces the business on the screen when everyone in the game is teamfighting in one area.