@keef247 Not mandatory (board game and arena) just skill points and gear locked behind them.
The gear doesn't bother me so much but having combat effectiveness (via skill points) gated behind a board game tournament? Bonkers.
It's truly amazing that in Aloy's frantic and time-critical bid to save the world, she has time to enter a board game tournament. And that the people starving because of blight and machine attacks have decided it's OK for members of their community to dedicate themselves to playing a board game.
And it's a naff board game to add insult to injury
And requires you to hunt down the more powerful pieces hidden in the world (think chess but you have to obtain the Queen before you can use it, but your opponent has all their pieces from the get go).
The whole thing is just a time sink. Again, this is how they've decided to add "morerer" gameplay - timesinks and grinding.
You *can* avoid the whole thing, but then you miss out on those skill points. Does it matter? If you're playing on V.Hard as I did, every little helps.
Pro tip: Don't play on V.Hard. It just makes grinding more painful. (A number of threads on Reddit suggest grinding on Story mode and then bumping the difficulty back up to do the quests, but I'm too stubborn to do that...)