Completely irrelevant to reliability.Mac hardware tends toward being more tightly integrated. This means fewer options --- which can stink for the user -- but its easier to support a limited number of hardware configurations.
How does this support your statement?I had an 11 year old Hewlett Packard PC. BIOS updates for the motherboard were nowhere to be found. The HP website offered no driver support and tried to sell me another PC.
OS X Mountain Lion broke compatibility with my 1,1 Mac Pro. OS X Sierra broke compatibility with my 3,1 Mac Pro. Ironically I can run Windows 10 on both of these systems.A Windows 10 update broke compatibility with the sound drivers.
And my 2007 PC, running Windows 10 1809, keeps running without any problems.My 2012 mini keeps running without any problems.
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11 years might be an anomaly merely because PCs don't cost as much so people don't have an issue with upgrading to new ones every few years.That is just wrong - PC’s get so buggy and loaded down with crappy “free” software and invaded by every bug - and that doesn’t include bad Microsoft OS upgrades - I use PC’s as well - I have both. You are an anomaly at 11 years, not the norm.
Having said that your point has no bearing on whether PCs last.