[inopinatus]

It is a matter of self-identification. I take the phrase with a large dose of irony. If someone calls themselves a full-stack developer, I assume they mean "JS/CSS/HTML/<app language>/SQL" and this is especially likely in this case, since it's a SO poll.

But I still want some sense of awareness of the many layers on which web systems rest.

"Oh you're a full-stack developer? Great! In this job interview we will be designing a new TCP retransmission algorithm, configuring a CI/CD pipeline, debugging CPU microcode, negotiating with a law enforcement agency, and testing the FM200 system in the DC"

[Drdrdrq]

I would identify myself as full stack web developer, but the problems you list (apart from negotiations) sound interesting to me... What does that make me? :)

[inopinatus]

My experience is that someone's willingness to understand/develop the whole canvas greatly enhances their potential effectiveness in leading major pieces of work.

Caveat #1: far from the only factor.

Caveat #2: increased risk of decision paralysis and (paradoxically) micromanagement.