For my sins I am still VAT registered, from the days from when I used to produce a small range of hand built 1:32 slot cars. Each quarter I still fill out a VAT declaration form (I can't bare the thought of dealing with that labyrinthine edifice, the HMRC, to sort it). For some years now HMRC have been receiving VAT declarations from me that basically read - 0,0,0,0,0.0,0.0,0.0,0.0. And never a query asking, "How come" has been received. Just the odd fine for £537 when I'm forgetful, that is immediately rescinded as soon as I supply the required declaration.
When sending or receiving goods to other EU member states I could not deduct my VAT price element or ask suppliers for a rebate of this element as I could with product destined/received from ROW destinations. The quarterly VAT declaration form has (read "had" as of next march probably) a section that requires me to enter any VAT elements of my trading with EU with products destined there or being supplied but not VAT free trading for export/import. I always felt that the ability to deduct VAT on sales on ROW product was a bit of an export trading bonus, as most of my trade was. Yes, the recipient in non EU destinations would be subject to their own customs authorities but it could work in their/my favour.
Now, I wonder how the VAT declaration form will be laid out for Q1 (due 30/4/21 latest) trading period. And will we be able to ask EU domiciled traders to deduct or show their VAT (assuming they are registered in their country) pricing element to be deducted. Does this mean that HMRC and Royal Mail will be getting involved to claim their fees on every "new built" item a private individual imports from and EU state ?

Max