That’s not true, at least for the past few years. I’ve only done a little over 100 trackdays with N2 over the last 3 season, but I’m pretty confident there is often more than one brand tire available. Not always, but often. I would know because everyone on Pirellis is constantly telling me how much better they are than Dunlops.
The confusion came from the word “exclusive.” I learned the expensive way last year what happens when you try running the wrong compound for the track and temperature. So, I need to have a plan for tires ahead of time, which I was hoping didn’t involve me storing a bunch of tires in my living room again. I can’t afford a garage because I spend all my money on tires, like any rational, responsible person would.