Maybe they'd settle badly if vehicles drive over them, kick up in the opposite corners and become a trip hazard.
The UK mostly skirts this by using tarmac and paving slabs instead of concrete.
Likely this won't be terribly faster, and I did see the company near us using a machine that was building curb cuts directly.
There are hardly any of these in the UK, for example, and kerbs are nearly always made of kerbstones that are sunk into the ground. They have their own problems with sinking when driven on, and I imagine frost heave in areas where the ground freezes seasonally. But it does mean that a dropped kerb installation is quite quick. Most dropped kerbs are simple tarmac ramps rather than concrete castings here.
Include a built channel for injecting hydraulic grout a few months later once the settlements happened to correct it out.
It would be cheaper to pay 60k a year per blind person to hire them a full time guid for waling outside.
Also, $60k/year is a) not nearly enough to pay a contractor full time living wage and b) not enough to cover the greater than full time necessary to assist someone. Blind people need to navigate the world at all hours on all days...
Why do you think so? Even the front wheels of wheelchairs are much larger than those of skateboards, and their main wheels typically are pneumatic (front ones, too, probably, but cheaper ones might skimp on that)
"Be hell for skateboarding" wasn't likely considered a bonus by the disability people because it would rally "those sort of people" to their (otherwise legitimate) cause.