There are a very few cases of the 3d view "telling too much". First of all, when a platform is killed, the wake of the "true" platform gets shown, regardless of view settings. Then again, see demon and mission status to see the same things.
And there are times when there are sounds of platforms in the area, while the platforms themselves aren't detected in the first place; I've detected helos in proximity that way.
However, it's also useful for things like knowing how far your sail is from breaching, if the floating wire is touching the surface (and as such, receiving), etc.
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