That's been my experience with desktops, but not with laptops. I owned the 2008, 2011, and 2014 15" MacBook Pro's, and all failed after about 3 years (fortunately, in every case, just before the end of AppleCare). The 2008 had a GPU issue, the 2011 had a thermal issue with the GPU, and the 2014 had a thermal issue with the GPU, a swollen battery, and a peeling screen coating.My experience has been that when chips fail, like the graphics card or the ram, that most of the time the computer is so old that it cannot be repaired with parts that are easily obtainable by the average person. The usual response is to buy a new computer. The exception is when the hard drive fails, that can often be replaced. Usually you’re looking at 10 years or more of service.
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I don’t think a computer’s lifespan is massively affected by warranty. Warranty is just to catch manufacturing defects or a bad batch of machines, faults near the beginning of the life of a computer.
While the MBP's were always given adequate air flow (elevated on a RainDesign mStand*), it's possible the GPU thermal issues occurred because they spent most of their time as a desktop replacement driving an external monitor (which means they were always running the discrete GPU), in a room that was often on the warm side (low 80's in the summer and fall).
OTOH (or perhaps I should say consistent with this, since they were both desktops with great thermals), my PowerMac G5, and my custom-built Pentium PC, never had an issue, except for a failed HD in the G5.
Because of the better thermals, the AS laptops should not have the thermal issues I experienced. Still, you can have issues with the battery, screen, ports, etc. Here are my two pieces of advice:
1) Get AppleCare!
2) If you get a laptop, get a stand to elevate it above your desk when you use it at home, and use it with an external KB and mouse. This will protect it from spills.
*Here's what I use: https://www.raindesigninc.com/mstand.html
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