This line of argumentation only appears compelling to those who assume from that start that the core assumptions of the standard evolutionary model are true.
Evolution is all, or almost all, evolution by destruction. Michael Behe gives the analogy of a bridge separating you from an invading group of enemies.
If you want your sons and daughters to be well educated about evolution, then hope their biology teachers don’t rely on materials from the Genetic Science Learning Center.
In effect, protein engineers are using the power of random change plus intelligent design to see what if anything will improve function.
There’s something very clarifying about seeing an argument laid out in crisp bullet points.