Both internal promotion and external recruitment are very important ways to select people, but both have their own pros and cons. What do you think?

What are the advantages and disadvantages of internal promotion and external recruitment?

The advantages of internal promotion: (1) It is conducive to mobilizing the enthusiasm of internal members; (2) It is conducive to attracting external talents; (3) It helps to ensure the importance of the selection work; (4) It helps the candidates to start work quickly.

Disadvantages of internal promotion: (1) Causes dissatisfaction among colleagues; (2) May cause "inbreeding" phenomenon.

Advantages of external recruitment: Recruited cadres have "external advantages".