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If BSP is supposed to be "outdated" (which it isn't) then why the move to pro?
Im pretty sure the reason is that BSP is now seen as mostly irrelevant to most needs, and is kept mostly as a legacy option.
Bascially BSP is worthless for outdoor scenes, and most purposes, octree organization is fine for other types of levels as well.
The BSP and PVS method used in Quake was designed for pre-hardware accelerator computers. Hardware has changed some of the ways we handle rendering data.
I suppose there are still uses for BSP in some engines, but I think only in certain specific cases.
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