While this is an interesting idea, no doubt, epigenetics casts major doubt on whether knowing the DNA expression at a particular time is diagnostically useful.

Sure. There are some conditions that are purely genetic, but many genes can be switched on and off depending on the environment - or even recoded in the replication process. DNA isn’t as static as we once thought and knowing a person’s DNA is not quite as useful as we imagined.

This isn’t as big of a deal as we imagined. It’s going to take some incredible processing to uncover causal patterns, and a huge amount of experimentation to determine whether they are stable against epigenetic changes. In my opinion, this is quite exciting.