Hi laneif2
It's a standard statement that assessors frequently use - there might be occasions when it's appropriate and others when it isn't. They can use it, implying that someone's condition might improve, and they might not need the same amount of support; if their condition worsens, they may need more. I have seen it used even when someone has been awarded enhanced for both mobility and daily care - but they don't have an ongoing award.
I understand your frustration when you have a condition that only worsens, but the DWP will argue that they cannot judge how quickly someone's condition may get worse. If you're filling out your form, you can always request a longer award in the section where it asks if you have anything else to tell them.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems