I've just began learning about endianness and I'm sorry if this comes off as pedantic, but doesn't the last example refer to bit numbering rather than (byte) endianness?
Endianness applies to both! Or, it should, if you're being consistent. It makes no sense to say that the first byte is the most-significant byte, but that bit zero is the least significant bit of the byte.
Because all modern computer architectures assign addresses to bytes, not bits, it's up to us to decide which way to number the bits. But we should always number the bits the same way we number the bytes.
Because all modern computer architectures assign addresses to bytes, not bits, it's up to us to decide which way to number the bits. But we should always number the bits the same way we number the bytes.