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> Language features like templates are not the issue – the Standard Library is.

What sins does STL commits that make it slow if templates themselves are not slow, and what kind of template code doesn't bloat compile times? In my experience, C++ libraries are usually one order of magnitude or more slower to compile than equivalent C ones, and I always chalked it upto the language.

Why do they use the bottom bit for tag and not the top bit?

Teardown calculates collision meshes and does physics on those. Not on voxels directly, and definitely on in voxel space.

So how would you do destruction physics on voxels without meshing? This is how even Teardown does it, and it uses raymarching.