It will only reset for the season characters.

does that mean that they’re going to straight up break the builds of our current characters

No, nothing should be changing for your eternal realm characters. They will still have the renown unlocks completed and you won’t have to re-farm anything.

Think of seasonal as being a separate realm similar to hardcore realm. But instead of having nothing carry over like from softcore / hardcore, they’ll instead automatically credit you for completion of the altars and the map exploration. We’ll still need to run the side quests, unlock waypoints, and complete strongholds and dungeons to finish up the renown unlocks.

Not sure why they’re not giving us the waypoints. At least we’ll be able to see where they all are with the map already explored. Playing a second character now is irritating because you start with the whole map blacked out and can’t even see where the waypoints are.

I don’t mind doing the dungeons and strongholds again as they’re actually enjoyable and will be completed doing whispers and nightmare dungeons anyway, but the side quests just drag on and on once you’ve already done them multiple times.

Wha? Not sure I understand your actual Q.

Best resource I’ve found for understanding all this is Rax’s video here:

https://youtu.be/A9OYL5ZWrc8