I think 4 years experience gets the "Senior" title in our company now. I can understand having 3 years experience and being frustrated when you can see how much better you are at your job than your "more senior" middle managers, but... there are plenty of things that you continue to learn in your first 10-20 years of experience, and having diversity of experience brings even more value that's rarely acknowledged in any ranking scales - actually the ranking scales usually reward stay-put loyalty over diverse in depth experience, and that's just backwards in my experience. Although, I have also known plenty of "job hoppers" who got around from place to place every year or two and it was clear after working with them that was because they didn't really contribute adequate value anywhere they went.

Everyone calls themselves senior because that's the only type of position recruiters look for.

I'm a mid level dev, but I'm encouraged by recruiters to apply for senior positions because their clients are actually looking for a range of levels

Exactly. We don't hire "junior" positions, because all the midlevels are juniors, all seniors are mid-level, and seniors don't apply. I'm a senior and a recruiter found me, I didn't apply (at least not to this company).