Nobody ever explained what benefit there was other than the meaningless slogans.
The UK government are not implementing the extra checks required by the agreement and WTO, they've still got the implementation of the new UK certification , UKCA, which is hardly mentioned now, the loss of equivalence in the financial and services sector and mulitple other procedures over the next few years. There are few trade advantages to obtain and plenty of losses.
The government know Brexit is a disaster which will only get worse, not better, and are grateful for any distraction; DUP helping out at the moment.
Labour hardly challenges the government on Brexit because both Corbyn and Starmer were both Brexiters. Their slogan is "make the most of Brexit" . How do make the most of the most stupid disastrous act of self-harm? What can possbly be done to alleviate the problems they've brought on themselves?
Even the most racist xenophobic numbskull would never have got what they expected. The Uk needs immigrants and immigration is higher now than before the referendum.