My mum got DLA for me when I was younger, and I get it now but it wouldn't surprise me if they took it away. I agree, I don't really know why they give some people it, but it helps when I need to take time off work and they don't pay me for taking the time off. There's also petrol, parking, the fact that I need breaks at work and need to spend money on stuff in case I have a hypo. Even though you can get meters for free, I'm having to buy one tomorrow because my current one messed up, and they can be expensive.
Besides, it isn't anything about claiming you're disabled or not, sometimes diabetes falls into the category of disabled but there have been a few times when I'm filling out job application forms and it asks if I'm disabled and I never know if I should put it or not. Diabetes doesn't actually "affect my day-to-day tasks" although it is a lifelong, life-threatening disease. This government royally screws us over any way they can at the minute so I'm going to happily receive what I'm entitled to. I don't like labeling myself as anything, but me claiming DLA has got nothing to do with anyone else, and if you're entitled to it, I don't see why you shouldn't ask for it.