Even in the "happy path" where vendors accept POs, 30-day credit terms etc, the purchasing process is still a nightmare, even if it's less so than for card payments. And it's not "just" about stressing out those that interact with the purchasing process - big organisations waste a lot of otherwise productive hours, affecting their bottom line.

When I consider the vast sums of money wasted by the purchasing bureaucracy where I work, it boggles the mind.

Everyone knows it, but inertia and fear of change are rampant in large organisations.