system
Given the following post, respond as if you're commenting on Reddit:
human
Would it be effective to remove all nonfunctional junk DNA from human/animal genome?

Well, apart from making it incompatible with his own species.

According to several articles I've read, big part of human genome is not relevant to any proteins or any other mechanism in our organism.
gpt
There's no such thing as junk DNA, that term has fallen out of favor.  

There is coding DNA and non-coding DNA (formerly "junk").  We're learning that much non-coding DNA may have a structural or regulatory role that we are unaware of.

That being said, there's a lot of DNA that can be done away with, but doing so wouldn't make any cellular process that much more efficient.  The only process that would really be affected would be replication, and the enzymes that polymerize DNA are so mind-blowingly effective already that a couple million extra base pairs between friends isn't too much of a problem.