Multi-currency pricing, a live catalogue that doesn't fall over during a sale, and inventory that's actually accurate, whether the sale happened online or at a register.
Correct pricing and checkout across currencies, not a plugin bolted onto a single-currency assumption.
A live catalogue that stays fast under real load, not just in a demo with twelve products.
Online and in-store stock reflecting the same number, tied to ERPNext POS and Inventory where that's the right fit.