I think you’re touching on 3 issues here
1- you dint know this person life. They might be working as a cleaner but have adaptations at work (eg regular breaks) and they might then spend the night in huge pain. But they need the money so carry on,
2- PIP is imo a game on how to answer questions. I don’t mean lying at all. But how to frame your struggles in the format that works for PIP.
eg your dh walks with a stick. If you say that he can walk 50 or 100m with the stick as an aid, you’re cooked re getting the enhanced mobility.
If you say he can walk 50 or 100m but he is very slow so it’s taking a really long time to walking those 50m, then it’s accepted as unable to ‘do it at a reasonable standard’. If he walks that distance but then his pain increases badly for the day and he can’t do it again? It’s not safe for him to walk. And he can’t repeatedly do it. You get the enhanced mobility.
(fwiw getting a BB also helps)
3- what makes a huge difference is the evidence you have.
Despite what DWP says, assessors do not trust people at all. If you have no evidence of your struggles, they dint believe it.
So the ‘trick’ is to gather evidence as much as you can. From NHS support services, Social Services or let’s say an OT you saw privately to help you organise the house/finding the right stick etc etc….
Fwiw That’s why it’s worth having support filling those forms.
If you feel your dh meet the criteria, then get support for the next time (now, don’t wait for the renewal forms!).
Ask fir the report of the assessor. This will tell you what they ‘believed’ and what they didn’t. In turn, it will show you where to get more evidence if you can.
And do an MR. Assessors are known for saying NO in stupid occasions. There is a reason why 70% of cases are overturned at tribunal!!
But please don’t assume that if someone has PIP or enhanced blablabla and you dint, it means they’ve lied.
Much more likely that the issue is somewhere else.