I think there are two different issues mixing here:
1. it is not very easy (but very feasible as many mentioned) to find the point where tracking leads you to. Actually I think it's very easy to find the point if you accept a distance of a few meters remaining. The normal prospecting will cover more than a few meters.
2. material tracking is not very accurate in surface areas. even if you get to the exact point that tracking points you to, you are not likely to find matching materials there (unless you use large range prospecting).
The 2nd issue will make you feel you were suffering from issue 1. but changing issue 1 does not correct issue 2.
1. it is not very easy (but very feasible as many mentioned) to find the point where tracking leads you to. Actually I think it's very easy to find the point if you accept a distance of a few meters remaining. The normal prospecting will cover more than a few meters.
2. material tracking is not very accurate in surface areas. even if you get to the exact point that tracking points you to, you are not likely to find matching materials there (unless you use large range prospecting).
The 2nd issue will make you feel you were suffering from issue 1. but changing issue 1 does not correct issue 2.