Particularly within IT many people get hired, promoted, and fired solely due to office politics or for diversity checkboxes. The diversity is great at the company and important. However, many hires and promotions within IT are solely for meeting diversity checkboxes so some unqualified people end up in important roles. Also, many people that are in management roles are due to office politics and not due to being the best fit.
A lack of cohesive collaboration and processes is also a challenge. People are regularly emailing people that sit next to them to cover themselves instead of having real collaboration. Another example, there's so much bureaucracy and different teams within IT that improving an internal workflow can take months. One time I passed on feedback in improving some processes and lack of collaboration to a senior leader in IT and they responded "What am I supposed to do" and immediately was dismissive even though the issues were all under their department. Individual contributers and front line managers don't want to speak their mind at risk of being targeted politically so the company has difficulty innovating and fixing some significant issues.