I think there is a culture of such fear within the medical community that doctors are practicing increasingly defensively.
Back in the day, with less overwork and burnout and more continuity of care and access to appointments, a reasonable GP would take a watch and wait approach to a benign history like this in a low risk individual.
Now however they have 8 minutes with someone they've never met before, they don't necessarily know that patient has always been slim and both parents lived to 100 etc, and if they don't refer you STAT you may really struggle to get a further GP appointment if the problem persists. Also there's much more litigation generally now.
This situation creates a burden of over investigation and overwhelms waiting lists for people with actual cancer.