Re: Bad for the environment?
"And you pulled that range from where exactly?"
Probably from the average refresh cycles in the corporate world. Which isn't wrong.
"If we compare your software support lifetimes, then the minimum Windows support lifetime recently was about 8 years (if you bought a computer in 2017 that can't update to Windows 11), assuming you don't bypass the restriction and update it anyway, assuming you don't pay for the extended support, assuming you don't just install something else on it. For most other machines, including those released a year later, the software support lifespan is quite a bit longer, probably at least 12 years, again with multiple options to extend that. "
Great. 8 years of Windows mainstream support for an OS which is a resource hog and which is increasingly loaded with ads and other monetization features. Which comes on top of an already wobbly software platform which regularly suffers from annoying bugs and botched updates which, more often than not, kill major functionality because the software vendor doesn't really do "QC" any more (that's now the user's job). Updates which also take forever to install and which slow even high end hardware down to a halt.
Even in your best case scenario (i.e., with overriding Windows 11 hardware checks) that's 12 years of pain, running an OS that is increasingly built as advertising platform and around monetization of users, until they can finally move everyone to the cloud (which is what Microsoft is working towards).
"Meanwhile, the increase to ten years from Google is only as of a couple months ago, before which it was 6-8 years"
Actually, it was 8 years, and has been for a while.
"and all the numbers, including the recent 10, start counting from a random date of the manufacturer's choosing which is well before anyone could buy one."
True (although the date is not random, it's based on when the computer model was released), and vendors and especially stores need to be more forthcoming about the AUE date, which is a problem especially in the consumer space (less so for businesses, as they don't tend to buy older hardware, also admins usually know their shit and check the AUE date for specific models with the manufacturer or on the Google website before buying).
"In order to defend a Chromebook, you're just making up a number to suggest that other devices expire long before we all know they do."
The number sounds fine to me, at least for business use (which makes up the majority of PC sales). Clearly, you're looking at this from a different angle (home user/hobbyist), so YMMV.
In any case, 8 or 10 years of support is more than enough for a laptop, a mobile computer which is often exposed to rough handling and other abuse (more so than a desktop), which is rarely expandable in a way that makes financial sense, and which is dependent proprietary parts like batteries which are expensive consumables that degrade whether they are used or not.