TBH SAP is almost required for big corporations as they usually are publicly traded companies, require external audits from BIG4(and these guys know how to get data from standard SAP models, not so much from you self-developed system) and have to report their financials in consistent way.
For example Apple, Microsoft, Amazon and Google all can use SAP internally. But it would be false to state that all their businesses are run on SAP...
For example Apple, Microsoft, Amazon and Google all can use SAP internally. But it would be false to state that all their businesses are run on SAP...