Evidently the personal bots will use PR’s based ONLY on last 90 days so I suspect that will be more limiting.
Having said that, our data is gold and Zwift will know it - they still have it around. I suspect the reasoning is either performance (CA) or cost reductions (I had thought I had seen lower storage costs on AWS for “archive” type data storage as opposed to current data, but that was some time ago, or in my sleep).
And Zwift being Zwift, still make all our fit files available via ZwiftPower going back to the day we signed up … go figure.