we have 15 minute cities everywhere and I want to see my aunt in Arizona, but I live in Seattle. Now what?

Take a plane, a train, or an automobile!

How do you feel about motorcycles, electric bikes and scooters?

I'm fine with them. I'd prefer that they stayed off sidewalks, but that's my only real thought on them.

Let's say that I hate Amazon and want to keep small businesses in business, we don't have that type of small business in my 15 minute city, do I bike 3 hours to the next one?

If you want to. I think a lot of the other commenters suggested using public transit. You could also drive. Maybe they do mail order?

You need transit, not everyone is 18-24, naive, and healthy with no kids

All of the comments I've read haven't mentioned transit, or have been transit positive.

It sounds like you're being deliberately obtuse, but just in case you're genuine...

Cars simply weren't a thing people had general access to before the 1950s and yet the economy and people did just fine. The huge majority of "getting around" that people need to do are going to work, going to school, shopping and entertainment. Do you really feel like having a 10 minute walk to work would be so hellish and dystopian? Wouldn't it be nice if your kids could ask to go play in the park and they could just go 5 minutes down the road without you having to drive them? You could be a regular at that nice taco place down on the corner. You could buy more fresh produce if the grocery was across the street. If you do need to go to another city or go a farther distance, are you under the impression that people want to eliminate cars entirely? Cars are an amazing invention but the issue is over reliance, not their existence. By all means, drive or take a train an hour or two out of town but not everyone wants to have to drive to take their kids to school, sporting events or friends houses, or just to go grab food somewhere, or to see a movie, or all the other mundane daily trips that are part of every day life.