Indeed. I suspect it's because not much has actually changed yet. If, as is becoming increasingly likely, there are severe supply-chain disruptions later on in the year we'll probably see the pendulum swing back towards being inside the Single Market and Customs Union at the very least.
Quite a lot seems to have changed in Northern Ireland (supply chain disruptions particularly), and very quickly after the final-final-we're-really-really-out-now date earlier this year.
Anecdotally, I drive a section of the M4 quite a lot and it has been noticeable how the number of EU-plated lorries has reduced, certainly over the last year, but definitely since the start of 2021. It seems that hauliers running goods from the mainland to Eire are putting their lorries on to the new ferry routes directly from France to Eire, with all the additional costs involved there, rather than having to produce the reams of paperwork required and run the risk of customs checks and delays by sending lorries via the UK route. Presumably this also reduces the ability of hauliers to "multidrop" en-route and therefore possibly means more lorries on the road in total as separate loads are sent for the UK and Eire.
On a personal level, I have needed to buy a specialist water pump this month. There are one or two UK-based companies which supply pumps by the same Italian manufacturer, but none stocks the exact model I need. Instead I had to order it from a supplier in Germany, who were extremely helpful and gave excellent advice about the pump.
However, they were not entirely sure of the intricacies of exporting, other than knowing that they would charge me an ex-VAT price (German VAT is 19% on this item) and hand the parcel over to their usual courier. Instead of placing the order and waiting three days for DHL to deliver, it was six days later that Parcelforce sent me a letter asking not only for VAT (fair enough) but also for £7.53 Customs Duty and a £12 "Clearance Fee", whatever that is. Those two items make the cost of this pump about 5% higher than it would have been without Brexit, and I am hoping that the pump will be delivered today, ten days after placing the order.
M.