Dev's origonally thought in PS1 that prone would slow the pace of gameplay ergo we never had it. With hindsight however it was posted that they wished it was included in the origonal development, since post production would have been too costly or something close to that effect it was never added.
Personally I don't see the harm in prone. Skeptical at first in BF3 but aside from the hiding in corners (with your feet in a wall) its never been an issue for me
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