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Great point Phil. It's also important to note why multi-tenancy matters. From my POV, everybody focused on the economic benefits (shared compute infrastructure) - which is for sure important. But equally important is that all customers are actually running the identical version of the software. In a "private cloud" model, a vendor could theoretically deliver updates to thousands or millions of so-called "private clouds" but that would only work if each and every customer were running identical hardware/software stacks, and each provided the vendor with unfettered access to upgrade the software as they see fit. Not realistic to say the least. And even so, the care and feeding of those systems would still be ridiculously inefficient. And for what gain?
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