My argument is against online price-matching being a suitable way of shopping for parents with young children, not against visiting toy stores. I see I wasn't clear that: taking your attention off your children to focus on your phone in an area with a high number of distracting items will likely lead to a situation where you need to reassert parental control.

Did you know? The 2-year-old will tantrum regardless where you are, and buying online means you don't have a quick out on hand (either getting the toy almost immediately after calming down and ensuring enough separation between the tantrum and getting the toy, or some stopgap alternative toy that's a tenth of the price).