One relevant, if impertinent, anecdote I can relate ...
Many years ago, at 0-dark-30 on the way over the ditch (pre-FMS days), ATC requested a spot wind.
Now, the three of us, not having made such a calculation for some considerable time all retrieved our various prayer wheels, determined the input data and came up with three quite dissimilar answers.
During a second attempt the answer proved to be just as elusive.
Not being so crass as to nominate my own as being correct, we elected to average the answers, reported L&V to ATC to keep those worthy folk happy .. and still found our way to the destination on schedule ...
Perhaps there is a happy medium with the current fancier kit .. but, at the end of the day, there really isn't any need to measure the sector distance to the nearer millimetre ...