I tried the last snapshot which has changed the ID management and I've noticed that the Old TNT has been removed on this "version". I guess it's an error...
This TNT was on the game with the tag "explode" on true, in 1.12.2 and before... (/setblock ~ ~ ~ minecraft:tnt 1).
We can still have it on 17w45 in the Debug World but in 17w47 this tag has been removed even in the Debug World.
So I would like to know if it's only a bug or if it has been voluntarily removed, because this features is a really nice one for map-making especially.
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I need this old tnt back because it makes me feel nostalgic of when I played minecraft in 2011.

What exactly were the motives and intentions behind removing this? I don't see any harm caused by this block existing in-game.

Wondering if this change is final.

Well you can download or create a mod that brings back the old tnt.

Yes, the removal is final; you can, however, request it to be readded at reddit.

18w30a added an "unstable" state that serves this same purpose.
The converter still does reference it, which makes this removal seem unindented: