Why bloodmoon rising and other coop no longer exist in overwatch arcade

From an interview with Michael Chu, a Senior Game Designer on Overwatch (emphasis mine):

If you look at a game like World Of Warcraft, the Horde/Alliance split is such a big deal and such a defining aspect of the game. But Overwatch, pretty much from the start, we didn’t want to restrict ourselves that way. Because the game is so much about having the flexibility to play all these heroes and finding all the ways they play well together or against each other. Because of that we decided that the gameplay of the Overwatch universe wouldn’t be bound by that.

Our story justification – what I usually tell people – is that I think of it as, it’s clearly not canonical, but I think of it as how in comic book stories sometimes Iron Man and Captain America fight each other. Maybe in this instance on this map they’re fighting – for some reason they have some ideological difference or something that’s bringing them against each other.

But I think ultimately it was important for the game that you were able to play whatever characters you want. Blizzard has this development philosophy which is ‘Gameplay first’ and this is definitely an example of where we’ve gone with that.

No, I've done this with Roadhog shift (Hook) as I wanted to know if this counted towards the end game statistics.

It appears it doesn't start counting them until the match begins as even though I spammed out the abilities and shooting it would only show the stats after, 100% if I landed it 0% if I missed but 50% if I hit the second shot out of 2 regardless how much I spammed during the prep stage.