That is a small part of it, but you're missing the forest for the trees. Gwyn and Gwyndolin was consumed by their desire to maintain their power and authority, and to preserve the society they had built. Seeth was consumed by his fear of death. Big Hat Logan wanted knowledge. Solaire was searching for a purpose. Siegmeyer merely desired to go on a journey. You have a large host of characters, with diverse desires. Some are grand, and some are extremely humble. And yet, regardless of their desires, they all come to the same end. If there is any freedom from this, it is only to free yourself of earthly desires and attachments. Because, inevitably, everyone and everything will be forgotten. Most of the characters in DS2 aren't aware of what happened in DS1. And the world of DS3 is a dreamlike landscape where people, places, and time periods are all smacked together as time begins to break down.Hmm, not really sure I agree with that. It's pretty clear that hundreds of thousands of years (at least) have passed between DS1 & 3, for instance, but the impact of stuff from DS1 is still acutely felt in DS3, and some of the entities are even still around.
Plus, the sheer weight of all the suffering on display in the series... I really doubt the point of the series is to say, "this doesn't matter". It's more to do with the folly of keeping a painful, malfunctioning system going long past its natural endpoint.
Honestly, people here are over analyzing the series. The games are very inconsistent and even contradictory with their lore, and I don't think the creators thought much about how the games fit with one another. The themes of death and decay are the only things that are actually consistent between the different titles.