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Similar experience. In active use in my house:

    2012 MacBook Pro
    2015 MacBook Pro
    2019 MacBook Air
    2020 M1 MacBook Pro
The longevity is incredible.
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At least two of these are now on completely unsupported OSes that are no longer receiving security updates (and lots of latest versions of apps won't work). Especially given the uptick in major CVEs of late I'm very nervous about reconnecting any of these machines to the internet :/
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My first gen 5k iMac (2014) is our kitchen machine these days. Still a joy to use. The final gen (2020) model is still my main machine.

I almost wish one of them would konk out so I can get an M series, but then I wouldn’t be on a 5k iMac anymore, which would suck. Love these machines.

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The last few models of Intel Mac Pro that I used were mostly good at getting really hot.

Dropbox would fire up to do massive walks of the filesystem tree and the fans would take off. I think the thermal interface material on the GPU got cooked at some point. It would be a relatively easy fix, for me a couple of hours, but I chose to fix it with an M1 MacBook Air.

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Just use. There were two models that had issues with the gpu desoldering, 2012 and 2015 iirc? I was lucky enough to have them. I put the mobos in the oven (180deg for seven minutes?) and that would fix it. For about a month… and then 2 weeks.. and then… I actually have a 2018 that I borrowed from a friend after my 2013 Air ssd gave up, it is still working I think, but its twice as slow, at least as my Air was. Its so weird. The Air stayed ‘snappy’ even after my friends Pro’s would become too sluggish. Maybe because I never update ;)
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Sounds like user error tbh.
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Its from when they switched to lead free solder. Its a known issue.
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They fare differently in dusty environments, for one. Airs being sealed do well.
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