Surely we are talking about real applications not toy educational snippets. Or are you claiming that what works for the dozen or so lines in a typical Rosetta code example works just as well for million line, multi-user, multithreaded, object oriented simulators and optimizers of electrical machines?

At risk of moving the goal posts, I suspect that actually writing such a program in assembler might well be impossible simply because it would probably take too long to write and debug.

If assembler tooling were improved perhaps this could change but who will do it. There have been assemblers with object oriented extensions, perhaps other developer aids could be created. But who will expend the effort?