There are literal homeless setting up tents in downtown Portland. I am not convinced SLC's problem is any worse, or any more apparant, than other cities - beyond panhandlers and I'd say we're similar to Portland and Seattle in that regard.
In terms of tent cities, Boise had one right at a freeway entrance into downtown, so, not located out in the middle of nowhere. Salt Lake's is located in an area of abandoned buildings, an open field and limited tourist interaction. Granted, the Gateway is close to the proximity of these areas, but the major camps, the people lining up on the grassy area just west of the Rio Grande, is not anywhere a tourist would randomly wander off to because there's nothing there beyond a couple warehouses, the back of the Depot, which isn't even really a tourist destination itself, and a few empty fields.
The people who see these camps are the people who go looking for the camps or hear about them on the news or from other people.
But the overall point wasn't that these areas might be shielded away in some of these cities from areas where there's a lot of foot traffic - Tony's point explicitly said they didn't have these camps like we do at Rio Grande. That's not true at all.
Also, in those photos I posted, there are multiple areas where the camps are in very close proximity to areas of the city. Like...
These are not just areas isolated from these cities - they're, in some instances, right in the heart of each city. It's no different than the Rio Grande area except we're more aware of it because we live here.