People don't really understand what Salesforce is and what they are good at. Yes its PAAS and so on.
But the core skill of the people at Salesforce is that they've had this thing online for 20+ years, most of their customers have extensive customisations, and three times a year Salesforce push new features to the platform while successfully minimising the amount of customer customisations they break.
And thats the key - how can you regularly expand and improve your PAAS without fucking up the extensive and very complicated custom things your customers have built on top of it. Its actually a very hard engineering challenge that no-one really talks about because its a long term challenge and not many people focus on long term engineering.