Two points.
Firstly, if the person has an NPPL, then as they're daylight VFR only, they're a tad unlikely to conflict with PT stuff, assuming for the most part PT stuff stays where it's told in controlled airspace.
Secondly, how many HGV drivers have died recently from a sudden incapacitating undetected condition ? Any idea ? What about ATPLs who've died at the controls of airliners ? Following what I perceive is your line of argument, how come we're not worried about drivers on the road who fulfil NO medical requirements to hold a car licence ? Maybe HGV drivers should be concerned about sharing their roads with the rest of us.