This is a terrible point. Giving the UK the advantages it requests will give the UK a competitive advantage over the other EU countries. Why would they disadvantage existing members by offering the UK a deal that makes it the only non-EU state with perks only member states have? UK is leaving so why is it more democratic to help the UK to the detriment of current members, than to ensure a level playing field for all (remaining) members?
seriously, the EU is looking for the interests of 400m people, why would they donate anything to the selfish UK?