Shorter paths (fewer arrows along the way) do not indicate a quicker career growth path. To the contrary, often gaining experience in multiple areas helps develop as a well-rounded executive prepared for senior leadership roles.
Certain roles are not listed explicitly but are combined into other roles in this illustration. For example, the roles of Security are merged into Systems in this view. Also, roles like Senior Engineer and Lead Engineer are not shown separately, but covered by Engineer and Engineering Manager. Similarly, Senior Manager and Senior Director are also not shown separately. Incorporating that level of detail would have significantly increased the complexity and decreased the readability of the diagram.