This is a really bizarre hill to die on. Ultimately, it won't really matter in 2 years, but this looks terrible, right now. But the commercials write themselves. "He voted to gut the ethics committee. Why? What are you hiding Representative?"
It's a simple thing anyone can rationalize. "Why are they gutting the ethics committee? What are they planning?" And the GOP hasn't even offered any real reason to gut the committee, other than "we can."
This is a prime target the Democrats can use for messaging, right now, and prepare themselves for the bigger fights coming up.