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I'm running out of oomph here, Button. Sorry.
Many commentators think that the WTO is a broken reed which is disregarded when it suits nation states. And, by and large, they have a justifiable argument. However, it remains the only fallback for international trade that we have, when there are no other specific agreements to override it. Sovereign countries can say what they want and do what they want, which is essentially how we've go to where we are now.
However, international trade is a vital issue across the globe. Look at China and America's trials and tribulations in recent years. Europe remains the world's most successful trading block. We can do what we like until our actions start to catch up with us and other, non-EU countries, start to retaliate. Our government is fully aware of that, otherwise we wouldn't be talking about inland border facilities. The problem they have, of course, is that it contradicts all the BS that was used to justify Brexit in the first place.
Remember all those loons parading with placards saying 'we love the WTO'? This is the start of their legacy.