I have to credit ChatGPT4 for this answer.
Credit, or a warning?
From my understanding a big part of the problem with PET is the availability, either because it's such a small percentage of plastic and demand is too great, or because it gets lost among all the rest and so is mixed or ruined for recycling.
Honestly the debate on which material is better totally ignores the real problem - consumption demand. Reduce used to be the first 'R', but it was not friendly to the capitalistic mindset or an exploding population, so Recycling became the big focus along with the subtle blaming of the consumer for not being THE solution when they didn't participate.
I have a laptop that's suffered from that for a while now, so it's not just one update but a trend. Tried a number of things from clearing space to even a manual download on a USB to force it. It always reverts back to churning away trying to complete the update, restarting, and then reversing it. The irony is the laptop works fine until it comes time for it to check again, then repeat ad nauseam.