Their GPU's didn't support the instructions needed to use Metal. Which is why Mac's before 2012 could not be upgraded. Then more recently, I had to upgrade my friends iMAC with a Kepler GPU because Apple's latest OS's from High Sierra onward use a newer but significantly more low-level and efficient METAL graphics API. So they technically couldn't upgrade, period. But the fact was their cpu's didn't have 64bit instruction sets. People lost all iOS updates and were understandably upset. Like when iOS switched from 32bit to 64bit sometimes around the iphone5 to iphone 6. Many people have said this, but when I dive deeper into it, I've found actual technical reasons for loss of software updates. Apple have shown little regard for backwards compatibility for anything in the past. Sizzling said:That’s probably part of Apple’s business case for doing this.
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