I have no idea where this "post hardcore" thing is coming from. Ive never heard them called that. Looking at this wiki TBS is the only band I'd ever compare any of their releases to. Care to fill me in on some gap I'm missing?
I can only suggest that you need to listen to some of those bands - I see a lot of similarities.
Edison Glass, Blindside, Dead Poetic, TBS, We Are the Ocean all jump out at me when I look at your list of examples.
Especially Edison Glass, holy shit.
To summarize: chill out, dude.