I'm very lucky where we live in that there are usually more than enough BB spaces for anyone who needs one in the town and supermarkets.
However, while visiting tourist attractions (National Trust etc) we have had some difficulty finding a space where we can get the wheelchair in and out of the car easily. All the BB spaces have hatching around them to enable wheelchairs to be unloaded and loaded. But many BB holders are not wheelchair or pushchair users, so don't need the extra space around the car.
If some BB spaces were the normal size but still close to entrances and exits there would be room for more overall.
AIBU to hope that spaces with the hatching for wheelchairs should only be used by those who actually need the space? And that there should be more "standard size" BB spaces for those who don't need the space?