I think that goes way too far. Assembly is a completely different beast from C and way more complex. There is a lot stuff you can do with assembly that C can’t.
I agree that they are different beasts, but is there anything that assembly can do with data which C can't do? Or are there only control efficiencies which assembly can provide which C can't?
X86 has a lot of instructions that aren’t directly available to C and provide huge speed up. Often the optimizer will use them anyway but there plenty of cases where handcrafted assembly is much faster than anything C can achieve.
