Having a lot of projects is not ambitious.
It's not a moonshot.
It's not thinking big.

It's just too much work.

Every project you add to your team's list increases your latency for learning.

Every new project extends the timelines of the projects around it because it pulls in resources the way a black hole pulls in light.

Every new project increases your team's overhead and reduces your ability to deliver.

Every new project means:

More people + responsibility for knowing and understanding their capabilities.

More meetings.

More email.

Another chat.

More context-switching.

Less thinking.

Every new project is a threat to your current projects.

Every new feature idea is a threat to the features you already have underway.