TRIM support has been baked into Windows and OS X for long enough that new SSDs aren't typically tested to evaluate the impact of not running TRIM has on the drive. Exactly how far depends a great deal on workloads, available free space, and how much idle garbage collection the drive controller performs independently of the OS TRIM command. Being able to perform TRIM and clean the SSD when its sitting idle is vital to keeping the drive at maximum performance - without it, an SSD's real world performance will steadily degrade over time. We say "effectively" because while third-party SSDs will still work, they'll no longer perform the TRIM garbage collection command. Now, with OS X 10.10 Yosemite, the company has taken another step down the path towards total vendor lock-in and effectively disabled support for third-party SSDs. Over the last few years, Apple has introduced features and adopted standards that made upgrading or using third-party hardware progressively more difficult. One of the disadvantages to buying an Apple system is that it generally means less upgradeability and flexibility than a system from a traditional PC OEM.
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