An online shop that isn’t connected to your other online business admin tools creates work rather than saving it, because somebody ends up copying and pasting. The useful version is connected to whatever else the business runs on, so that order data tags the right people on your mailing list without anybody exporting a spreadsheet, enquiries land in the system your sales people actually watch, the morning stock figures from your fulfilment centre are checked against what the shop thinks it has, and the sales report writes itself and arrives by email instead of being assembled by hand each month.
Integrations like this can save hour upon hour every month. It is also the work that dates a website least, because it is about how your business runs rather than how the pages look.