Plane line point vs plane plane plane

I like the idea of trying to mimic what the ASME standard explains using tangent planes and extracting the furthest points using variables and constructions. How often is this actually used in practice though? I've seen a lot of programs written by suppliers and customers that state ASME standard on their print and none of which used this method. Not saying it's proper, just that I haven't seen it in practice, only in theory. In order to "accurately" find the highest points, are each plane scanned with high point densities to ensure the the points closest to the highest points are found?
if someone can give me opinions on this, it would be appreciated. It seems to me, if a plane is only probed using 4 to 10 points (idk the size of these parts or planes) and a tangent plane is constructed, one of those points may not actually be lying on the highest point of the plane which would cause error. Also, if correlations are required with you and a customer and both use tangent planes, I would think that the alignment could change to some degree depending on where the points are placed and correlations could fails when tight tolerances are involved.
Thanks for the insight.

I like the idea of trying to mimic what the ASME standard explains using tangent planes and extracting the furthest points using variables and constructions. How often is this actually used in practice though? I've seen a lot of programs written by suppliers and customers that state ASME standard on their print and none of which used this method. Not saying it's proper, just that I haven't seen it in practice, only in theory. In order to "accurately" find the highest points, are each plane scanned with high point densities to ensure the the points closest to the highest points are found?
if someone can give me opinions on this, it would be appreciated. It seems to me, if a plane is only probed using 4 to 10 points (idk the size of these parts or planes) and a tangent plane is constructed, one of those points may not actually be lying on the highest point of the plane which would cause error. Also, if correlations are required with you and a customer and both use tangent planes, I would think that the alignment could change to some degree depending on where the points are placed and correlations could fails when tight tolerances are involved.
Thanks for the insight.