text: I see the slight difference between allowed and physically possible, but which isn't important for normal traffic (and routing engines). It is only relevant for emergency vehicles (e.g. ambulances or fire trucks), which can ignore the legal permissions, but not the physical ones. But it hard to fix the data now if there are so many mistakes in the wiki. Also, what are the proper tags to tag the physical accessibility, if it isn't https://wiki.openstreetmap.org/wiki/Key:access ? foot=yes on a lift gate isn't a problem for me, as there are some where 'foot' is not allowed/possible, some where it is, and some are private only (foot/access=private). So tagging foot=yes to specify what it is seems correct to me. Otherwise there may be doubt and I think routers should avoid such unsure barriers.