Believe me - some will try and find something political in everything I post…reading my mind or reading between the lines. I myself first became properly aware of import duties when we sent a parcel from Australia to UK back in 2019 - daughter had to pay a whack of duty when postie delivered it to her, and so to today as you point out.
People are still facing a shock to the system about import duties, VAT, clearance costs etc. We get delivery drivers every week showing parcels in their van that will be going back because customers refused to pay the extra charges 'because they didn't realise'. 40 odd years of simplicity on that front has changed. Like it or not it is where we are.