I will just say that some classes are limited and are not meant to do the things people want them to.
Cat will never bark, it does not matter how much you try to teach it.
Blood DK will never have a "good" AoE threat, in comparison to other Tank specs, and will always lose aggro on multiple targets when a Fury warrior or a Ret paladin is going full burst AoE damage mode.
As for Improved Icy Talons, it is up to you to be honest...
Maybe that 1 FDK dies, and you kind of wont gain anything special in return if you skip that talent.
https://wotlkdb.com/?talent#j0EMqIhcsbobsZhg0xcMhZ0x - more avoidance
https://wotlkdb.com/?talent#j0EMqIhcsbobsZhg0xcMoZ0g - more Death Strikes
Wont change much or affect anything to be honest.