Wheelchair users are a subset of pedestrians. If your pedestrian infra is shit, your wheelchain infra can't be much better. (Sure, only if you count whatever remains of pedestrians infra, it might look acceptable).
On public transport this does not seem to be the case at all. Low floor buses, trams and trains are much, much more common in Europe. And bike lanes and better overall pedestrian infrastructure is much better.
So I really interested how you are getting to this 'wheelchair accessibility' is better in the US. I would love to see some data, and not just 'we have X more ramps', but actual people in wheelchair going into their experience.
In other ways - wheelchair accessibility for example - the US is miles better than many European cities.