Usually my first thought on this kind of story is that we* brought it on ourselves. This time, though, I'm more inclined to the opposite point of view, purely because of the numbers. Why would 11 countries have a problem if the other 16 don't? Are they just playing silly beggars? And is it me or have the BBC stated that it's 11 countries... and then named 10 countries? * Not me personally. Just "we" collectively.
We did bring it on ourselves - pre Brexit there was no issue, now we need to agree with each individual European country something that takes time and effort - given we cant even provide our own healty citizens with Passports in a timely manner its not hard to see issues affecting just a minority who are disabled gets a low priority from our numpties in charge. This really is a Brexit issue that should have been resolved though.
It may have been provoked by the fact that certain areas in London decided unilaterally not to accept European Blue Badges.
It's the issue of equivalence. One of the hidden benefits of being in the EU. The more we diverge from EU laws, the greater the risk that equivalence is increasingly lost, and when you start to realise just how much equivalence and harmony there has been, you start to realise how ridiculous it is to diverge and how damaging it would be to have to create completely brand new independent standards and just how much effort and cost is required to monitor and manage such things. From qualifications, to standards to measures to equipment to health and safety and so on and so on. In time it will be almost impossible to work in the EU if you are s skilled person with a UK qualification because it wont be recognised in the EU. That just seems petty beyond words that we'd pursue such an avenue.