That’s why NET30/90/etc exist — without an incentive to pay sooner, invoices will just sit around on the receiver’s books until it’s convenient for them to pay (e.g. to make their financials for a particular quarter look good.)
Invoices under contract law are like PayPal’s arbitration process: “always favours the buyer.” A seller would need an explicit pre-existing contract clause stating a due date for an invoice, in order for a due date declared on an invoice to have any force; by default, it doesn’t. And because invoice billing is something companies tend to offer mostly to companies they’re trying to stay on the good side of, they don’t tend to sit them down for a binding contract negotiation when doing so.