In case of Stellaris it is more like you would buy Stellaris, Steallaris 2, Stellaris 3, etc. Each big DLC is like another game in the series. And the smaller ones (like species pack) are completely optional. For me this is an example of DLC done right.
It is not like e.g. City Skylines, that most DLCs just give some minor additions and for a meaningful change in the game you would have to buy lots of them.
In case of Stellaris it is more like you would buy Stellaris, Steallaris 2, Stellaris 3, etc. Each big DLC is like another game in the series. And the smaller ones (like species pack) are completely optional. For me this is an example of DLC done right.
It is not like e.g. City Skylines, that most DLCs just give some minor additions and for a meaningful change in the game you would have to buy lots of them.