"Then you think from an internet point of view, is that the best experience we could have given our shoppers? Now we all understand why we got there but I still feel like it's a kind of 'faster horse' experience.
"We're better than that. The world is ready for more than that."
The 2017 summit focused on all forms of digital and online trends due to become mainstream in the years ahead. Mr Miles said online grocery selling will become increasingly divided into two streams: autoreplenishment of boring but essential basics, and service orientated ways of enticing customers to buy new things they may not have considered.
Coca-Cola's massive reach means its focus is on retail partnerships, Miles said, except in the case of the successful "Share a Coke" campaign where names were written on bottles and given as gifts.
The phenomenally successful campaign began in Australia in 2011 with 150 names printed in a specially designed font.
It saw more than 250 million cans and bottles sold in a single summer and has since been rolled out to 70 countries around the world.
Coke has suffered a bad month in Australia, losing a Domino's contract and failing to get its no sugar offering on the shelves in Woolworths.
Miles said recent anti-sugar trends have seen the company lead with Zero or Diet products to provide more choice, but doesn't see a future where full-sugar Coke won't exist.
"That'll never be the case. People want to be able to choose that occasionally. There is the absolute right occasion when that's exactly what you want is to be able to choose an ice-cold Coke."