The thing is, this also assumes that job postings are an accurate representation of the employer's expectations. I think it's a common trend for employers to as

The thing is, this also assumes that job postings are an accurate representation of the employer's expectations. I think it's a common trend for employers to ask for much more than they realistically want, in exchange for weeding out those who feel incompetent and unable to meet certain requirements. That being said, I think that when employers ask for full-stack developers, they actually want someone more experienced in a certain part of the stack, yet still familiar enough to get their hands dirty with other parts of the stack but not necessarily at the expert level. In other words, candidates who are more well-rounded yet focused in a certain area of expertise will likely stand out the most and meet the employer's expectations.