this seems like a bit of a red herring. "locking yourself" is a bit under-specified - picking unity, unreal, cryengine, phyreengine, or whatever is also doing

this seems like a bit of a red herring. "locking yourself" is a bit under-specified - picking unity, unreal, cryengine, phyreengine, or whatever is also doing just this. choosing physx or havok is a fork in the road. etc. presumably one is making these choices after carefully evaluating options.