Quite.
What the UK continually forgets is that the EU is a rule-based organisation. With 28 (soon to be 27) countries and their own individual views, no-one trusts anyone to have a 'gentleman's agreement'. So they lock everyone down into a strong set of rules that everyone can understand.
The UK seems to think that now Article 50 is in place we can by-pass the rules and chat up each country and sort out individual deals.
2 things wrong with that.
1 it's against the rules we still have to abide with
2 it shows the 27 that the UK can't be trusted to stick to an agreement, and with uncertainty over what the Govt will be even next month, how can agreements proposed now be relied on by Brexit day.
Any sensible country would want the UK locked into a firm and legally enforceable treaty before agreeing any reciprocal arrangement now - especially one negotiated by Grayling who, let's face it, isn't the sharpest knife in the drawer