The primary job of a tank is to hold threat whether it is worse or not. If 4 off the bat lets your group aoe to their hearts content, or lets you focus more on dps and dodging, then do it, it is only 4 GCDs. I very likely don't need 4 flashes depending on the groups dps but it works. Im sorry that the tank changes are a culture shock to many of the tanks who adored pretending to be a dps, but the fact of the matter is that tanks have 3 main priorities in a specific order.

1. Holding threat
2. Staying alive
3. Killing things

This is what tank is meant to be. They aren't intended to be dps powerhouses. They are intended to have to actually work for threat, not just pop a single flash and then have everything glued to them bc they are wearing all dps gear. Is my way cheap, yes. But it is effective and is no different from a tank realizing halfway through a pull that they need to flash another couple times. Either way it is the same amount of flash.