I think it’s a good thing. I don’t see the point in being given half a tree every time I buy a Mars bar. Even if you don’t want actually a receipt it still automatically prints and then goes straight in the bin. It’s terribly wasteful.
Conversely, if I need to find a receipt for something I bought last year, email is considerably easier to search than looking for a scrap of bloody paper that might be in the house somewhere.
I was under the impression that you sometimes required a receipt for warranty issues etc?
You don’t require a receipt for warranty purposes, but you may require proof of purchase. Receipts are handy for proving that, of course, but it’s not the only means.
It would be difficult for them to argue that you hadn’t bought Halfords Microfibre Cloths from Halfords, for a start off (though you could’ve stolen them I suppose).