They're tires. Given, the tires that come with the vehicle were specifically designed for the Rivian, but, as long as the load rating is adequate, get what you like. Many will want a more aggressive tire, be it for appearance or off-road use. As a 7,000 lb vehicle, it may wear out other tires faster than the stock tires will wear out, so cost factor increases a bit. But, if you're buying a Rivian at $80,000 +/-, a few hundred more in tires likely isn't a big issue. Maybe they wear out in 20,000 miles instead of 30,000 miles. But, if you get something that gives you the look and/or use you want, go for it.
I've had Tesla's for years. They want something like $450 per tire on my car for the stock tire. I buy the cheapest tire I can find that suits my preferences. Last set, I paid about $550 for the entire set. Even I wear them out twice as fast, I still came out way ahead.
If you're planning on any type of heavy off-roading, as others stated, would not go with 22's. 20's are better suited, but can still get a tire you like for 20's as well. My plan is to get a tire more with a "mudder" type appearance, simply for aesthetics than for use. Probably will wear them out twice as fast, but, they'll also likely be half the cost of the stock Pirelli tires that come with it.