> There are many other possible ways to achieve this, but the point is that further contribution at this point usually needs a radically different way. I do see that many companies tend to grant a title of "Staff Engineer" to those folks able to figure out how to handle this situation.

In my own experience it's also entirely common for your comp and responsibilities to grow and grow until your working peers are all directors, VPs, and heads of this or that and you're meant to act as their API layer to an entire team of humans executing on your technical direction, but your title is just Senior Engineer.

Internally everyone understands this and treats you accordingly, but it sure looks bad on linkedin.