I guess the key reason why software developers are not engineers is that there is no barrier to entry. If a necessary requirement to build a bridge is to hire a certified Civil Engineer who has undergone the necessary ethics and reliability training, then you have no choice but to pay up for that certification cost. You can't outsource that work to Eastern EU or Asia or hire another one willing to "hack" the bridge to deliver it on your tight timeline.

On the other hand, if someone takes software reliability seriously, either they are going to burn themselves out to meet the crazy deadlines or are going to "not deliver on time", in which case they will be replaced by someone who can "get shit done" cheaper and faster.