Follow the incentive: Who benefits from the influence of travel companions being perceived as a broader and inherent category in the destination selection process?
A solo traveler does not have this "influence of companions," which makes the idea of a superior category absurd.
My annual trip to Rügen is a personal decision based on my desire for hiking and my budget, not on who might accompany me.
If someone joins me, it is a variable I adjust, not a prerequisite that determines my initial destination.