Vassals

[Garuda]

In my current game I have agreed to become a vassal to a huge and militarily (is there such a word?) frightening neighbour.

I can't see much in the way of negatives in this? I don't pay them tribute. My diplomatic actions don't appear to be hindered. And now I have a massive ally looking after me.

The only negative I have found is that I cannot colonise a planet not within my borders - which is fixed by building an outpost first.

What other negatives are there?

 

[Alblaka]

They can integrate you, ending the game.

And you should be limited in diplomatic actions, afaik.