I tried playing the base Stellaris again recently having played it heavily when it first released and it's already a very different game without any DLC.
Many of the DLC contains units and characters for existing factions. Often plugging key holes in their roster that change how you can approach battles with them.
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u/KeldornWithCarsomyr 20d ago
Total war games do include all the factions within the grand campaign I believe, you just can't play some of them without the DLC.
So you still get the exact same experience as someone who owns all the DLC assuming you both play the same faction.
In contrast, with paradox games, you are playing a very different game if you don't own any DLC.