I think the fees they tack on for online orders would ruin ordering different products from different stores. It mostly makes sense with staples that don't perish.
With fresh produce I find Pak n Save a lot more variable with quality, making online orders more risky despite the lower cost.
For those who have to order online (e.g. elderly), they are paying the fees anyway. They can avoid minimum order fees with bulk purchases of staples. Their bot/app can monitor prices and when a staple goes on sale, they can order multiple items to meet the threshold for a lower fee.
With fresh produce I find Pak n Save a lot more variable with quality, making online orders more risky despite the lower cost.