Thats because it is better for the game but the frustration isnt coming from heartstop itself being removed the frustration is coming from the idea that this class only being A tier at best, is getting nerfed really really hard, and theres 0 other changes that theyre pushing out for it
They couldve removed heartstop later in the ptr when they had a more complete list of changes for deathknight but instead they just pruned a spec defining honor talent and left dk players in the dark about what the future of the class will look like
Theres other glaring problems the spec has like deathstrike and frost strike being grossly undertuned. Incase youre wondering deathstrike heals for a whopping 5% health as a minimum and it takes 5 globals to use it twice, so 10% hp in 7 globals
And frost strike does 2,000 damage per hit, and you can use it 4 times after 5 globals to build the 100 runic power
So if you mashed frost strike 4 times in a row each with a 1.5 second gcd, you get 8k damage looooooooooool