Geography is fair point, but threat? What is the identifiable threat against Switzerland? Probably not high intensity tactical air operation but a strategic air raids at most. If some rogue country decides that Switzerland is giving too much support for the West they will use either terrorism or ballistic missile to deliver their payload, not a normal air raid.
If the threat is already in neighbouring countries, SAM's can securely operate at SAM contested airspace, fighters can not.
Besides, without proper BMD defense the few Swiss airbases can be effectively neutralized. Do the Swiss have plans for BMD defense? Air defense can not be constructed using fighters alone.
For mere air policing, Swiss have ample Hornets.
It's like the three most important things about a shop: location, location & location. The three most important things about Swiss defence are geography, geography & geography. Any rogue state launching a ballistic missile against Switzerland will have to launch it from a long way off, since Switzerlands neighbours are not now nor likely ever to be rogue states - geography. Switzerland could only detect such a missile in the terminal stage of its flight, when it'd be rather hard to defend against, since Switzerland is small - geography. The neighbours would detect it much earlier, & if equipped with suitable missiles, could shoot it down more easily, perhaps in the boost phase - geography. Since they would not, when they detected it, know it was aimed at Switzerland, they probably would try to shoot it down if they could, & if not, they'd probably bomb the brown stuff out of the country that launched it. Not something the Swiss need to worry their little cuckoo-clocks about.
"Strategic air raids" against Switzerland are impossible. The EU can close Switzerland down by closing the borders, so no have no reason to launch any raids. Either invade to conquer the country, or apply economic pressure for anything less.
Nobody else can reach it except by conquering the neighbours, at which point they're in the same position. Either invade to conquer, or to pass through it to flank a neighbour. No reason for "strategic air raids".
Switzerlands armed forces are intended to make the country not worth conquering, not invulnerable to all attack. The latter is impossible, & they know it.
BTW, why don't you tell us about the superiority of SAMs to fighters in the wars of the last few decades, hmmm?