The goal is not to call people "engineers". The goal is to find the engineers. One way to do it is selection pressure: if the people who routinely produced non-working or otherwise impossible designs where eventually barred to do so, there'd be a better chance that the people left would be any good.

Does that mean we'd suddenly have a serious lack of engineer? Perhaps. That's only true to the extent that we already lack capable engineers now. It'd just be more visible.

I for one would like to be liable for my programming work (at least the part for which I'm paid). I could at least say to my boss "sorry, I can't risk approving that, we need more tests/refactoring for such and such part for such and such reason".