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If I have a cron job and reads the pressure file and simply stores its contents with a time stamp for later analysis, would that be enough to determine historic resource utilization?

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While already available tools should have sufficed and PSI should be good for it, a very important capability that PSI provides system administrators is its high-resolution. Using PSI, with specialized tooling, system administrators can automate sensitive workload scheduling.

I'm sure someone is already working on integrating information made available in PSI to Kubernetes so that the automation bit is taken care of.

why not dump it into a time series database - even something as simple as a set of whisper files on a local disk can be a lot more useful than a flat file. go-carbon is my tool of choice for this kind of job.

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