For many reasons.
First, you’re busy! I’m a big fan of developing internal coaches and facilitators to develop the new pipeline of leaders.
However, you have a job to do and if you’re like the 99% of other executives, your plate is already full with multiple priorities, and have very little time for coaching your team.
Second, you might not be a certified coach or facilitator so you probably don’t know how to approach team coaching that requires different skills and the experience to build frameworks that can lead to great results.
Finally, your team will feel much safer working with an external coach who doesn’t necessarily know the company, the business, or what is going on in the team. Equally, it’s always better to bring an outsider who can drive change without any bias.