Season Quests

If the game already categorized quests in its data, isn't that already a good enough reason? I don't think anything else categorizes these quests at all, aside from this page calling them NPC Quests, and if it's the game info vs wiki info, pretty sure game info should wins.

And can I get an explanation on how they're not related? They may not be the main storyline, but the same applies to Ascon and G11's Claimh Solas too, don't they? Instead, they're the connecters or the hole fillers; the bridges or the expansions. Most of them revolve around the important points of the main story, which is why I think they should be with the main walkthrough.