Yes and no. I feel like unemployment benefits are there for a reason, and if you lose your £100k per year job you are totally within your rights to sit on benefits for a few months because you don't want to stock shelves. That's why the dole exists, it's why we have contributions based unemployment benefits. But that only goes so far right. Eventually, after many months searching you still can't find anything you feel you are approriate for, then you need to lower your expectations, that might not mean going into delivering pizza if you were on £100k beforehand, but it might mean taking a £50-70k OTE sales job or something that you aren't too fond of.
Like, for me, I've been at the company I'm working at for years now, and they've been really good to me. I don't really have any relevant qualifications (still studying for my AAT) but because i've worked my way up and taken on more and more stuff, I'm earning £20k. If I were to leave or lose this job, I would not find another job earning 20k, because my salary is artificially inflated here because of length of service. I could probably jump into an £18k credit control job though I'd struggle a bit with it. I could hold out for a £20k job but I'd probably not have much luck and eventually have to lower my expectations. If I then couldn't get an £18k credit control job, or just some random 15-16k accounts assistant thing, I'd have to look into stocking shelves and delivering pizza and so on, too. I wouldn't jump straight into delivering pizza because fuck that, but if after a few months I couldn't find anything, I would have to.
That's not to say there is anything wrong with the job market, just that sometimes experience alone doesn't cut it. Sometimes it does and etcetc but...