Yes, exactly, which is discussed in the paper. The goal of gain of function research isn’t about “let’s make viruses that do crazy shit,” it’s a method of hypot

Yes, exactly, which is discussed in the paper. The goal of gain of function research isn’t about “let’s make viruses that do crazy shit,” it’s a method of hypothesis testing. When you can successfully add (or remove) stuff then you can test hypotheses that would otherwise not be testable.