I also agree, have some upboats.

The reality is that programming is an engineering endeavor, and in the face of limited resources, we have to choose the tools that can offer realistic benefits now.

Formal verification is not that tool for most projects right now. Would instagram or even facebook be better off? Most people would, correctly, say no.

And ultimately in the end, nearly all software (including quite a bit of open source software!) is written in pursuit of business reasons, and has to answer to that.