What they're getting at is that the individual level gadget based accommodations can lead hurdles against making the world generally more accessible to people with disabilities by putting the onus on the disabled person to buy those gadgets in people's minds, eg "oh we don't need to pay to put ramps here there's stair climbing wheelchairs", ignoring the cost of those devices. Yes they /eventually/ get cheaper but there's still plenty of people who can't afford even the cheaper versions and it takes decades to get there.