This is a pet peeve of mine, so while I understand what you mean, I will challenge you to come up with a strict definition that excludes software engineering!
And since I've had this discussion before, I'll pre-emptively hazard a guess that the argument boils down to "rigor", and point out that a) economic feasibility is a key part of engineering, b) the level of rigor applied to any project is a function of economics, and c) the economics of software projects is a very wide range.
Put another way, statistically most devs work on projects where the blast radius of failure is some minor inconvenience to like, 5 users. We really don't need rigor there, so I can see where you're coming from. But on the other extreme like aviation software, an appropriately extreme level of rigor is applied.