That arena was too much
I just finished the 6* shard arena. It is the only one of the shard arenas I've done this week. After the first few milestones I pulled a 6* Cull Obsidian, so I'd like to say right now: I'm not mad about a bad crystal pull. Best 6* I pulled since about february, which peaked my 6* pulls with Stealthy.
My problem with the arena is that I barely got it done before it was over and had no time to do the others. Sure, I could've done it faster if I sunk my whole life into the game for a week. Last time this kind of arena was present, I was able to do both the 4* and the 5* shard arena, go to my second account that I occasionally play with and grind out the 4* and part of the 5* arena as well. This week, my second account got nothing at all.
Put a bit more clearly, I dislike the exclusivity of this arena. It was either get 5k 6* shards and no other shards, or get the 5* shards for both accounts but no/very little 6* for the main. It wasn't possible for me to complete both, and that just left a sour taste in my mouth. I know this was probably intentional, it wasn't the plan to hand out 5k 6* shards for little effort. But I'm not a fan of the way this was done. No matter what I would've done this week, I'd have felt like I was losing out on something. Not a good feeling...