In a busy market, the network comes and goes. If your tools stop working when the signal does, you lose sales at exactly the moment you can least afford to.
Offline-first means your app writes to the phone first and syncs later. You keep ringing up sales, adding stock and logging debts. When the connection returns, everything catches up quietly in the background.
It’s the difference between technology that works in a demo and technology that works in a market on a Saturday afternoon.