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How is Apple not getting hit with an anti-competitive practices lawsuit for this?
Because Apple is not required to use hardware features on devices that they do not supply and may not have tested.
Both Intel and Crucial have sold SSDs in which there have been data corruption problems related to TRIM. So if Apple had enabled TRIM by default on those, customers could be looking at corrupted data or even a non-bootable Mac. Apple would be incurring huge support costs, and idiot fanboys would be calling it "TRIMGate" and citing it as an example of how Macs are unreliable and Apple makes crappy products.
Hope that clears it up for you.