Not just that.
Regular employment, paid or not, shows you have the self discipline to get yourself into work every morning. As someone who is now retired and no longer has this attribute, I recognise and appreciate it.
No it doesn't, some weeks I don't have any work at all, when I do it's usually one 3-hour slot. I've ended up missing it a couple of times, once because my sleep pattern is regularly screwed at least partly because I have no reason to stay awake most days and more recently because I had got confused about when I was supposed to be in (because of the irregular hours) and I'd missed it.
Even some volunteer application forms are too much for me, I haven't got a hope in hell of completing an actual employment application by myself without alcohol (and even then it took me too long to be able to submit it on time). I'm sick of getting work experience, I want an actual job - my job centre adviser said I could do work experience in their back office for a couple of weeks, 2 weeks then nothing (I said I'd be willing if there was the possibility of a job out of it) is not going to get me into a routine and I have had enough of work experience that doesn't involve a contract and financial compensation for my labour.