I've not yet encountered this, but when you wax the reed in place the hole getting filled with wax will make it more likely for the wax to hold the reed in place in the long term. So it certainly does not hurt.
There are normally never any holes all the way through. A hole does not help large reeds to start, quite the opposite. A hole might help a small (piccolo) reed to start but even that is not needed as the opposing reed on the reed plate acts as that hole. (A hole, typically in the wax, may help with something like a high reed in an accordina where there is no opposing reed on the reed plate.)