My perspective: at early stage companies, founding team would want generalists who can handle a wide range of things (usually growth - in multiple aspects). It's usually an execution based role (additional hands for their founding team), but sometimes work in planning the action as well.
Some of them write code as well. The role may include PM elements, HR elements, etc and usually would be coming with a lot of ambiguities.
Title might be fancy, but this role comes with a lot of responsibilities. Some companies use them in other ways which may lead to confusions.
Introverts might struggle in this role.
And as it's coming up: Engineers can't digest any other roles, although they can't handle such roles.