bluetooth is "good enough" for video games since there are other lag sources as well and one doesn't need anything approaching true realtime performance for gaming anyway (all games that run on windows are proof enough: platform general lag is some tens of ms just about always). consoles probably run something that looks much more like realtime.

for accurate measurements it's more of a problem since the lag can be rather large and is probably not constant either. workarounds include timestamping (as mentioned, however how accurate clock does the other end have and how do you sync it when coms delay is not constant?)