What aspect of low-level languages makes them less user-friendly?

Low-level languages are often considered less user-friendly primarily because they directly manipulate hardware and lack abstraction. This means that programmers working with low-level languages have to deal with the intricacies of the hardware itself, which requires a deeper understanding of the machine's architecture and operations. Unlike high-level languages, which provide abstraction and easier-to-read syntax by allowing programmers to work with concepts rather than raw hardware, low-level languages operate close to the machine's functions.

This lack of abstraction means that tasks that are simple in high-level languages can become quite complex when using low-level languages. Programmers must manage memory manually, understand processor instructions, and deal directly with the specifics of the machine's operation. As a result, this can lead to increased difficulty and a steeper learning curve for those trying to write software in low-level languages compared to their high-level counterparts. This characteristic distinctly contributes to the perception of low-level languages as being less user-friendly.