You have misunderstood my comment. I wrote until they die/become unusable; so your sentiment "One should use the machine while it enables an efficient workflow.

You have misunderstood my comment. I wrote until they die/become unusable; so your sentiment "One should use the machine while it enables an efficient workflow. As soon as it doesn't, and there are those that do for a reasonable price, one should switch" is implicit here. The "workflow" varies from machine to machine. For example; 1) Nexus 10 - battery replaced and being used a a ebook reader. 2) iPad (very old) - watch Youtube videos, surf and read iBooks. 3) Dell Inspiron laptop (2008) - Linux machine. 4) iPhone 4 - battery replaced, Stream music to a old Jawbone jambox bluetooth speaker. The sound is actually excellent, probably the iPhone4 DSP/DAC is very good. 5) Macbook Pro (2008) - Regularly used until a few years ago when it died. Needs to be repaired. 6) iMac 27-inch (mid-2010) - Was my main work machine until last year when it died. Needs to be repaired. 7) Surface Pro 1st gen (2012) - My only current usable machine. 8) Pixel 2 - My current phone. As you can see any old device can be very well repurposed for some specific use. One should not get sucked into the "consumerist mindset" pushed by external forces but always think about needs/wants, financial burden and environmental effects. This has always been my policy with everything be it cars/furniture/shoes/clothing/electronics/etc. i.e use everything to the fullest until they die/become unusable.