even if there are engine specific optimizations (like the #! javascript single page application path thing they promoted for a while), the major engines usually

even if there are engine specific optimizations (like the #! javascript single page application path thing they promoted for a while), the major engines usually converge towards a single format quickly. And the fringe engines (YACY and the like) had no idea how to work with SPAs in the first place, so no loss there...