That's kind of a crappy deal if you're still tethered to a colonial empire that's a member of a federated state.
If your population is 483 (not counting the tastybeests), you're probably thankful that you can outsource all the paperwork to a joint leader of thirteen like colonies...
As said, a planet isn't a particularly natural unit of self-governance, especially not with those DMZ colonies that appear to do a lot of stuff together and wither and die if isolated.
If that's the only example you're using, sure. But if you have a few million people, you're not going to be wanting folks literally light years away making the calls for you.
It would remind me of 19th century western US, a set requirement for statehood and until then you're a territory.