Garden retail is a handful of enormous days wrapped in a lot of quiet ones. A warm spring Saturday can do many times an ordinary Tuesday, and the whole of it lands between roughly eleven and three.
For a few hours a week the counter is the actual bottleneck of the entire enterprise, the single point every customer must pass through at exactly the moment there are most of them. The rest of the year it comfortably keeps up, which is precisely why it never gets looked at. Nobody redesigns a process that works fine for eighty per cent of the calendar and quietly falls apart during the twenty per cent that pays for everything.
And the cost of it falling apart doesn't appear in any report. There is no line called sales we didn't make because the queue reached the tomatoes. The trolley just gets pushed against a bench, and the customer walks out — and the only thing the books record is a slightly disappointing Saturday.