What I do like about the limited aspect is that it adds dynamism to the game, if they would add some actual lore to it instead of an ugly fox face.
They should've baked it into the world lore as such:

1. While the Warrior of light has been away from the Source the Beast tribes have been once again fervently praying to their primals to come back. Thankfully this takes them a long time to summon them but this also means the danger they pose to the world is that much greater. Will the Warrior of light answer the call? This would have add dynamism to the game as opposed to: Fox here, fight level 80 Shiva. It's really weird how they approach the game sometimes, sometimes they approach it from an Arcade/Call of Duty sort of way. Other times when they bring in guests like Matsuno or the Yorha guy they work hard on the lore. The game could really use more world dynamic content, specially if it's limited time. Seasonal primal summonings.