It is an interesting article. As it points out, both Sunak and Starmer, and even Truss's, less hostile approach to the EU has been welcome. At least this gives a better foundation on which to build a new relationship. Horizon membership was on offer as were better terms for musicians but the Brexiteers stamped their feet in a paddy and said No.
It all gives me a feeling of deja vu though. The UK could have been in on what then became the EEC right at the beginning, in the early 1951. But, IMO, Churchill's vision then, although he promoted the idea of a more United Europe still saw the UK as being firmly focused on the Commonwealth, so more of a detached observer. There was also the emphasis on the 'Special Relationship' with the USA. Suez ought to have disabused them of it being any sort of equal partnership but it didn't. The UK gradually realised its mistake and the mood shifted and we ended up joining the EEC. And then for most of us, the EEC, later the EU began to be less and less of an issue.
I think now, we will have a period like post Suez where we realise that the world has changed and we have deliberately chosen to jump ship (rather than missing the boat) and will spend another decade waking up to this, and then probably another decade trying to get back into what the EU has then become. It will need this generation of Brexiteers to be history too, which also fits with a 20 year time scale.
A little tangental to this:
https://www.theguardian.com/uk-news/2023/sep/19/clacton-on-sea-coastal-town-voted-brexit The Guardian two day's ago had an article about Clacton and how it was left behind. A couple of Brexiters are featured in the picture. Others are quoted (not necessarily Brexiters). They are all getting on in years. Why do the parties not realise that the young people are the future, instead of pandering to these and Red Wall voters? What's the use of talking about Freedom of Movement some say - the average Red Wall person won't want or be in a position to take advantage of it. True for the 50 plus age group, but for the 20s and 30s age groups - those who have grown up with being able to get a cheap flight to anywhere in Europe? It's just not such a foreign place as it was to older generations.
Going back to Katya Adler's article - Cameron rejected this idea of different levels of EU membership as I recall, because he wanted to be 'At the top table'. That turned out well!
Sorry, a bit of a stream of consciousness there.