Sagas makes me less interested in the game overall
"Sagas are 3 Month long seasons of content that will provide a canvas for solo and multiplayer content in addition to our regular Monthly content." Tagged champions receive boosts, and certain modes grant Tactics.
With what little interest I might have had in BGs/AW, the announcement of the upcoming Sagas has now completely torpedoed my desire to engage with those modes.
Incursions is probably also gonna be something I skip if the Defender's receive benefits from the tags as well (even though the attacker gains tactics).
Arenas are gonna be more of a slog since if the Defender's benefit from the tag they require more hits to take out.
Depending on the overlap with Winter of Woe and Spring of Sorrow, there might be some weirdness where certain champions might work better one week but not the next (when the Saga ends).
Overall, this seems like a creation that makes me less interested in the game, as opposed to more.