Dobsonians lack a motorized, computerized star tracking system. If you forget to keep moving the telescope to stay “with” the object as the Earth rotates, you’ll need to relocate it.
Dobsonians aren’t a great selection if you want to engage in astrophotography.
They can also be quite large when completely assembled. Check the size dimensions carefully. It’s not just that the telescope is big; you’ll need somewhere to store it when you’re not using it.