The powers that be just don't want to fork out for it, they make it difficult, as with welfare payments. With a nasty exception...
You see, in 2014 my mother was admitted to Epsom Hospital and nearly died, from a nursing home that had failed all its CQC criteria (Surrey Social Services knew of problems there and chose not to notify relatives.) Mum got put on Fast-track NHS Continuing Healthcare immediately - we didn't even have to ask for it! Wasn't that nice. Erm, after that oddly we found it hard to get any care setting, be it hospital or care home, to give her sufficient drink and when we prodded on the issue, things turned sinister.
It appeared that she'd been put on this thing because she'd been given three months to live. (She had advanced Parkinson's, btw) This corresponds to 'end of life care' not quite the Liverpool Care Pathway, but it seems if a care home resident or hospital patient is guesstimated to have around 3 months to live only, they can essentially be 'killed off' and this is done via dehydration and all round neglect. I think this is actually legal under NICE guidelines. Technically the family have to be notified but a) This came in under the 2014 Care Act so wouldn't have been applicable then b) They do what they want, they don't have to notify families really and c) If the family didn't know to get LPA in Health and Welfare for their parent I'm afraid they're not the decision makers for their parent's care anyway, once they're deemed to have lost mental capacity (a very vague area easy to exploit) so the State has full control.
For the next few years my sister and I had to visit Mum daily in the care home to give her drink as all our appeals on the issue fell on deaf ears. That winter in 2014 the fast-track healthcare thing was withdrawn, perhaps not unconnected to my whistleblowing the Surrey care home that nearly killed her to the local press. Surrey Council launched an attack on the family, timing it for Christmas as Social Services is won't to do, around the same time as the withdrawal.
Mum died in October 2017. Of course, she did worsen, as for the last few months she was on a PEG feed as her swallow worsened. We did apply for NHS Continuing Healthcare and got turned down. I now tend to see it as the 'freebie with strings' - if they grant it, they're sort of paying for your parent's demise, they get something back from it. Not saying that's everyone's experience, but it is ours, and otherwise it makes no sense because they really really don't like to grant it under normal circs.
We went along with it because I recall thinking, okay, you think Mum's got three months but I know better, so we'll take the freebie! Turned out I did know better about Mum, but not about what other State machinations.