Skill stacking

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/