How do you figure that? It seems to suggest the flexibility and adaptability of the genome, creating more possiblities, rather than problems, for evolution.
I guess it depends on how you look at it. With gene silencing you have a dramatic change by subtraction -- an order is given via RNA to stop a protein production and create a new characteristic.
Information must be added to a genome -- wings, thumbs, sexual reproduction --for common descent to be true. Dramatic changes in species is considered to be evidence of common descent.
That dramatic change is caused -- in some cases anyway -- by subtraction is an argument against the common wisdom.
But understand that in no way I'm claiming this disproves your position.