I was a TA for an intro to assembly language course, which means I got my office hours full of all of the students who struggled with assembly language and had to work with them one-on-one to get them over their roadblocks to pass the class.

Assembly language is not a reasonable first programming language. There's just so many things about it that make it a poor choice for programming instruction.

Chiefly, assembly lacks structure. There's no such thing as variables. There's no such thing as functions. You can fake some of this stuff with convention, but if you make mistakes--and students in intro-to-programming will make mistakes--there is nothing that's going to poke you that you did something wrong, you just get the wrong result.