318 compression test results

If you do a LD test it might tell you two things;
1) the condition of the very top of the cylinder, and
2) which valves are leaking and how badly.

Well wait a sec, the compression test already told us about the valves, and
when the heads come off for a valve job, you can physically inspect the tops of the cylinders......... So I mean, you can do an LD test but in my thinking it its like arriving at your destination with a flat tire and saying "I wonder when that happened"?