Turkey or Canada deals are nowhere near what the UK wants, to avoid an economic recession
Their economies are very different to the Uk, not so massively dependent on services.
Their manufacturing industry is not dependent on just-in-time components from the EU
They don't import 40% of their food
Canada isn't dependent on the EU for all its trade deals with the rest of the world:
As well as all the full FTAs, the EU has 953 bilateral agreements
e.g. MRAs (Mutual Recognition Agreements) and is party to 267 multilateral agreements.
The Uk loses all of these in the event of a WTO Brexit.
Canada is not dependent on participation in the Open Skies agreement for all their civil international flights to anywhere.
Or dependent on Euratom for supplies of their nuclear fuel and nuclear medicine
WTO rules make equal treatment mandatory in the absence of a trade deal:
The UK cannot impose tariffs or non-tariff barriers on the EU without also imposing the same to all WTO members with whom it doesn't have a trade deal, i.e. everyone
The EU must impose the same tariffs or non-tariff barriers on the UK as it does to all WTO members with whom it doesn't have a trade deal, e.g. like N Korea
Those countries who do have an existing EU trade deal would demand the same cake deal as the UK, if the unicorn brought cake once .....