There is the notion of skill shapes. Typically, I, T, M (sometimes Π, N, or E), and X (describing leadership), sometimes dash ("—", pure generalist), also tree.
The idea being to have some mix of depth and breadth. Multiple depths is often quite useful.
https://en.wikipedia.org/wiki/T-shaped_skills
Horrible quickly DDG'd blogs (the concept tends to attract — shallow exposition):
https://peoplecentre.wordpress.com/2017/06/19/the-m-shaped-e...
https://www.leadingagile.com/2017/02/e-shaped-staff/
https://www.linkedin.com/pulse/which-letter-shaped-future-em...
https://tcagley.wordpress.com/2016/06/14/productive-agile-te...
https://aboutleaders.com/skill-shape-leader/
