It will be fine for me mate, just thinking about others. If i wanted to print out and ticket arrived Sunday, I'd have no way of printing. And if i was digitally illiterate or didn't have a smart phone, I'd be concerned about not getting through the turnstile if every individual needs to show their ticket. Hopefully will be fine for everyone.
Bizarrely I ordered 6 at the same time and 3 in one block have arrived but three in a different one haven't. Maybe they're going out block by block?
Presumably they're still crafting the gold box that they're arriving in. If they're not, they should be, for what I paid for them. And I went for a middle of the road ticket.
For those booking a seat from today onwards then they'll get their email sometime after bank holiday Monday. Allowing for the holiday closure and the e-mail strike.