Earlier quoted context omitted.
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 business…
I would be interested to know if they are actually using SAP. These companies are so much better at software development and they are swimming in so much money that they could even implement something by themselves.
That's like saying "why doesn't Tiger Woods win Wimbledon? He's so much better at sport than anyone else". There are lots of different types of software development, and lots of different types of software engineers. Corporate IT projects don't succeed or fail on algorithmics - it's a completely different job, where 90% of the difficulty is managing people and politics