Why PMOs fail? Explain each sentence with example 1) Changes in executive leader

Why PMOs fail?
Explain each sentence with example
1) Changes in executive leadership (out goes the individual who supported the PMO, and in comes a person who does not favor PMOs)
2) The lack of project management maturity of its business leaders
3) The lack of in-depth project management experience in the PMO
4) The lack of collaboration between the PMO and its stakeholders
5) The lack of rewards and recognition when good things happen
6) The lack of project management training
7) The lack of business analysis skills in the PMO
8) The lack of periodic assessments of the PMO
9) The clashing of beliefs in traditional and Agile lifecycles
10) Functional managers want complete control of the organizational projects that impact them