Using TOGA obviously makes your flight safer, performance wise, even if you don't recalculate speeds.
Airlines want us to use reduced thrust to save on engines so if we are so concerned about using TOGA and not changing the speeds, aren't we saying using reduced takeoff thrust is dangerous and we should always use max? It seems like a lot of pilots are saying that in this thread.
If you want the lowest V1 then just use the max takeoff flap setting and max power. I'm sure the airlines would love that.
I think we are nitpicking this to death, personally.