It's no mistake. Most users should use 2.7.1.
2.7.5 uses launchd for scheduling, while 2.7.1 uses cron. launchd, in 10.6.x, is unreliable on enough systems that I think users are better off using cron. (The changes in later versions primarily focus on compatibility with later OS differences and peculiarities.)
If you're finding 2.7.5's scheduling isn't unreliable on your 10.6x system, you can continue to use it if you want...but in general, 2.7.1 is what users should install.
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--Dave Nanian
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