  Haag's theorem is a classic no-go theorem. It rigorously demonstrates there
is a logical problem with the interaction picture (IP), one of the most widely
used modeling tools in quantum field theory (QFT). The significance of the
theorem for the use of the IP in QFT has been the subject of long-running
debate, focused around how ``worried'' we should be. In this paper, we argue
for an alternative and opposite perspective on Haag's theorem, rejecting the
`worry' framing in favor of emphasizing the no-go theorem's implications for
model development.
