It actually works pretty well by chance more than anything else. 1000 ft is a really good altitude separation between aircraft. 500 is a good offset for irregular traffic too. Multiples of 150/300 m are more annoying to work with and 500/1000 m would waste an excessively large amount of airspace.

Idk about other brands but with Mazda you can call and get them to deactivate your car’s sim. IIRC in Subarus you can just physically unplug the communication unit.