We're talking about a situation where (theoretically) nobody is outside on the ground, no planes are moving (they're all at their gates), all trucks and vehicles that WERE moving are all parked safely out of the way of the planes, and incoming planes are making their way to their assigned gates and nothing is in their way and someone is operating the supposedly already-installed indicator system to wave the plane to the final gate position.

This is not something that's supposed to happen ALL THE TIME. This is what should happen for the handful of hours per year when there is lightning or strong winds creating a halt of ground operations, take-offs, and, if severe enough, of landings too.

If it's just a lightning threat, then I can't see why the planes can't land and make it to their gates as described above with minimal to no assistance from ground crew. That's certainly safer than having the planes fly around in circles in dicey weather, maybe get hit by lightning themselves, and/or have to divert somewhere, to refuel (with PAX on board) and perform an extra take-off cycle.

And again I ask where is YYZ's wind shear detection equipment? Or maybe the safety of planes can be sacrificed as long as the precious ground crew is high and dry during bad weather?