Let’s start with infrastructure.

Buses/metro/any public transit, barriered or not, sparsely or rarely exist. Even painted bike paths/walking paths, these usually exist ONLY in dense or older urban areas. You have either 1-1.5m wide sidewalk elevated 10cm or nothing separating you on foot from car traffic.

So that 250m is often on the shoulder of car lanes.

Now let’s talk property liability. You are responsible for injuries others sustain while on your property unless you have clearly posted signage expressing they were not allowed on your property. Even then and at best you’ll have to disrupt 6mo of your life tied up in courts+fees. (No right to roam. You do get the “perk” of open manhunting season on trespassers)

So that shortcut through the neighborhood where your neighbor laid out gravel because they care about community? Nope, that’s cyclone fence or cinder block wall. That alley between flats? Gated off.

It’s not even scale that’s the problem. You ALWAYS have to go around the ENTIRE block. A 250m Crow flight can easily be and most often is 1+km by foot, and only ever with a curb as your protection from traffic. You can’t safely get to geographically nearby places without putting yourself in mortal danger.

Also note European road design limits traffic in residential areas where the US grid system means every road is a main road and wide enough to promote excessive speeding.

Source: anecdotal/American living in EU

I live in DFW, a large amalgamation of two cities and a bunch if suburban sprawl in Texas.
I live in a neighborhood that is considered extremely walkable, as I am directly across the street from a university and less than a mile from city hall.

Here are my walking distances:

• To the nearest convenience store: 1.8km
• To the nearest chain supermarket: 4.3 km (They have a monopoly though, so unless you can afford whole foods, the closest good one is like 22.5 km)
• To the bus stop: Lol, we don’t have busses. A neighboring city does, so I guess 29 km?
• To the nearest park: Nearest park is 2.8km. Nearest public space is only 1.5km because I live right next to city hall.
• To the nearest big supermarket: 8.9 km to Walmart.
• To the nearest library: 1.5km, again, I live right next to city hall.
• To the nearest train station: 16km, unless you mean one for intercity travel. We don’t have one of those because Amtrak is slowly being killed.

Straight-line distance to Big Ben: we don’t have a Big Ben, but we killed JFK and that’s 34km away.

Bonus fun fact, I commute 42km each day. This is considered far by most people here, 32km would be much more reasonable.

In the suburbs of a middle-sized city in Ohio, USA. So midwest, but a bit older, higher-density, and more northeastern suburban layout than, say, Iowa. Built up in the 1960s-70s. Almost all single-family suburban homes on large lots.

(these are walking distances, not straight lines)

• To the nearest convenience store: 1.6 km
• To the nearest chain supermarket: 4.2 km
• To the bus stop: 1.5 km
• To the nearest park: 226 meters
• To the nearest big supermarket: 2.1 km
• To the nearest library: 2.6 km
• To the nearest train station: Hahaha! (Ok, it’s actually 78 km, but it’s mostly worthless as a train station)

Straight-line distance to Big Ben: 6297 km

Everything around me is a 30 minute drive… except the mailbox, that’s just a 5 minute walk.

I live in a walkable neighborhood in Richmond, Virginia. I have grocery stores in walking distance but usually drive to nicer ones for big hauls. I drive to the gym. I could bike there but there’s no bike lanes and steep hills. Everything else on your list is just a few blocks away.