The US is much better on this front than the UK. Not great for affording treatment, but there are curb cuts everywhere (in cities at least where there are sidewalks) and very few businesses are not handicap accessible.
Yes, there are curb cuts. But, the sidewalk only exists on one side of a 4-lane road. Or worse, the sidewalks jumps back and forth, forcing frequent road crossings.
Or, there are curb cuts and sidewalks, but no crossing signal on a 40mph road (where actually flow is closer to 50mph).
The buildings might be accessible, but you have to get across acres of parking lot and dodge distracted driers pulling in/out of spaces.
Lots of room for improvement.
While ADA access is important, it is not often the most important thing. But the lawsuits are forcing $100+ million settlements that take any prioritization of resources out of the hands of local voters or local legislatures.
Why spend $300million on sidewalks 'right now' when other services may be more effective (e.g., on demand shuttles, etc.)