Assembly language is still lacking:

• No Symbolic names. You need to keep track of the exact memory location that a piece of data is stored. That is, you must manipulate memory locations directly.

• Hard to read. Although we've made a few improvements by eliminating hex code, the command names are not always clear.

• Code is still machine dependent. We haven't really moved that far away from the machine language - just put psuedo-English labels on it. We still need to rewrite every piece of code for every machine.
• Hard to maintain and debug. Finding mistakes in machine code is difficult. Correcting them or adding new features can also be a challenge.

• Code must be heavily documented. It's very difficult (if not impossible) to figure out what a program does by reading the code. Detailed explanation must be prepared for future coders who need to modify or use the code.

Note: Assembly language is a compiled language: using an Assembler, a symbolic code written in assembly language can be translated to machine language, and the code in machine language can be directly executed on a computer.