It’s easy to use that uncertainty as an excuse to not set goals. Instead, realize that at first the goals will be arbitrary, so we need to change our response to goal attainment. Rather than using our results as a success or failure marker for individuals or teams, use it as a marker for better goal setting. Why did we or did we not set a good objective for this time period? What would be a better one for the next period?
Take the pressure off your goals by realizing that they start somewhat arbitrarily. First you calibrate the goals, then you have a tool you can use to better manage your team. You can’t measure your team without goals, but first you have to measure your goals. Otherwise, we’re mired in subjectivity. As always, the job is to turn art into science.