I assume that's caused because wooden halfblocks are probably just recolored stone halfblocks (supported by the fact even double wood halfblocks won't burn)
Noticed it too, will probably will be fixed eventually.
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Quote from Breadlord »
Quote from claivin »
Even though I have almost half a double-chest full of coal.
It doesn't make any sense. Shouldn't axes work better on wooden slabs?
should change it.
Some blocks have unique IDs. This means that in the game, the game thinks of them as "block 30, block 76, etc. etc. etc.". However, the game can't run infinite block IDs (the limit is at about 256 with some modification). So in an effort to save space, some blocks are simply one block with damage on. Since blocks don't damage like tools do, the code can treat a damaged block as a new block. For instance, wool colours are just damaged wool, dyes are just damaged ink sacs, birchbark/pinewood are just damaged logs, etc. And, of course, all halfblocks are just damaged smoothstone halfblocks.
Why do they mine best with picks? Because while damage might change crafting and looks, it can't change mining time (I think). So, since the "original" stone slab mines best with a pick, all stone slabs mine best with a pick. Unless Notch fixes something, even a dirt slab (if it was added) would mine best with a pick.
tl;dr: Slabs are just different-looking smoothstone slabs because technology.