I don’t think I have a same level of experience you do in terms of work because I’ve only had two different careers, thought I’ve done multiple jobs within those careers. However, I’m a perpetual student, and I collect degrees. Not just for the sole purpose of collecting degree’s but I like learning, and find it rewarding, and I find that doing it in a formal setting provides me with the structure I need to learn effectively. As such, I have a long list of “qualifications” I can put on my CV and I have figured out, if I list every qualification, I almost NEVER get an interview. Whereas before, when I had just two degree’s I’d find I’d almost always get an interview. I’ve figured out, if I only list one or two qualifications relevant to the job I’m applying for, I have a better success rate.

This makes me think that in terms of job searches, too many qualifications are a disadvantage. If the initial short listing is automated, then I assume too many qualifications means that you’re not slotting into the right niche that gets through the automated process, and if it’s humans doing the shortlisting, I wonder if they assume that someone with multiple qualifications doesn’t know what they want to do, gets bored easily (which for me is true), or they’re intimidated.

So ultimately, my experience is that your CV doesn’t have to list everything you’ve studied, or every job you have done. You can tailor it and only list qualifications, skills and experiences that are relevant to the job you’re applying for. But remember, if you do that, at the interview, you need to also only draw on the experiences you’ve listed in the CV because you can’t really throw in other work experiences that are not listed in the CV or they’ll ask why you didn’t list them. Overall, it’s easier to keep things simple. I generally find most humans prefer simplicity, so perhaps just package yourself up as something simple, but be excellent in the stuff you choose to focus on. That’s my current strategy for myself anyway. Not sure if it’s that helpful, but just another perspective anyhow.