Thats an idiotic comment for a few reasons...
#1, A spring stretches far less over it's lifetime, Look at Mangini's slo-mo drum video, Those heads move a whole lot more than you think... springs have a limited movement, heads do not.
#2 Springs have a useful life that they have been engineered to sustain, heads are the same way, they are disposable just like everything. They all have a lifespan.
Maybe some quick material physics would help you guys out here, materials have an elastic, plastic, and yield point. Elastic means the material will bounce back to its original state, this is the state the heads are in when new and when they are considered fresh... when they start to degrade in sustain and feel (they loose that "bounce") They begin to enter the plastic phase... this is when heads begin to loose the ability to bounce back into position. This is the phase we typically replace the heads, ever notice most well used heads when the tension is dropped are concave? That head has entered the plastic stage and been stretched out in the center by repeated vibrations and impacts. Yield point is the point at which the material breaks. All three of these phases can be demonstrated by over tightening or over stretching a head. Three stages can be also demonstrated by dents or holes in the head... you hit the head normally and get a great rebound... then you hit the piss out of it and get a dent, that area is now in the plastic phase as it has been stretched too far by the impact of the stick. Hit it hard enough and it will break through. It is easier to break into the yield point if the head is in the plastic phase already.
For those who want to know the truth about Reso heads, I use the 3 to 1 policy already mentioned... And despite the vent, the reso heads deflect and resonate every bit as much as the batter heads... the only reason we replace batters more is because the force of the stick is concentrated in small surface areas... whereas the air column moving the reso head is distributed rather equally over the entire surface area.
Hope this puts some actual facts behind the argument that new reso's sound better, I did in fact just place an order for new batters and reso's... and look forward to the drums coming back alive like they always do. Maybe I will make a video...