We don’t always “exaggerate” though. I can only cook a meal once a month, maybe twice. Otherwise I use kettle/microwave - for a simple food, not protein, two veg and carbs with sauce.
Then they will ask you about walking/going shopping, and extrapolate it, so if you can walk 100m you can stand up to cook. No mention of the cooking being prevented by shaking, memory loss, breathlessness.
I’d be all for a more intrusive exam if it wasn’t going to be Cherry-picked for snippets that are used against you. Tabloid journalists in the 80s reported with better accuracy than a PIP assessor!