lomapaseo,
I agree with your post. Meeting the south end of northbound swan while at 350 KIAS will probably mean big trouble regardless of whether your window heat is working or not. But, as there is no speed restriction stated in ECAM or the MEL then it must be safe to assume that the risk has not increased significantly.
If the certification requirements involve a bird carcass of a particular size and the window meets the requirements with heat ON then it would surely be a simple process to include a speed restriction for a heating failure which is statistically unlikely to happen all that often. The fact that no restriction exists speaks volumes.
So why is it that so many pilots feel it necessary (as I found out recently) to reduce speed to minimum clean or lower, refuse ATC speed control above this and try to stay as high as possile for as long as possible during the approach, even though no restriction is stated anywhere?? They must have got the idea from somewhere?? Was there a restriction on their previous aircraft?? Was this a problem that used to exist but has been solved now by modern manufacturing methods?????