Are you still rocking a 2015 MacBook or do you keep your devices for a long time?
If so, you should wait for the 2019 MacBook. It will likely come with the new T2 chip and Touch ID, plus other hardware that will deliver better support over time. That means more software updates, more features in macOS updates over time. The added hardware under the hood may help enable future features as well. Apple's previously restricted some features like unlock with Apple watch from older hardware due to hardware compatibility.
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