It's just hard. The guidelines the assessors can award you points is getting tighter. You have to meet the strict guidelines on every question to be awarded points.
I don't think the way they assess for points or the guidelines are inclusive or helpful. It's a very rigid yes or no.
So I'd say, don't shoot the assessor but do ask for mandatory reconsideration after ringing and asking for a copy of the report.
If mandatory reconsideration fails to award the extra points then go further to appeal.
At appeal you'll be able to speak to a doctor and another qualified person about why you feel you'd qualify for pip. They can override the points and award you PIP.
It's a horrible process, designed I think, in its current state, to take disability benefit off the most vulnerable.
You can also ask various charities to accompany you to appeal tribunal should you need.
It's also worth looking at and understanding the descriptors in each section and how points are allocated.
Wishing you all the best. Don't give up. This is the first hurdle.