I heard in 1.9 they're adding Shield Blocking and removing block hitting. Or blocking all together. So no signal to team
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I don't see why this is a bad thing. Block hitting was always more of a bug, and I'm excited to see what other things shields will be capable of. As for teaming, I'm sure people will come up with new signals for that kind of thing. Additionally there is the "Chat" feature that you can open my pressing "t" on your keyboard, using that feature will allow you to talk to other players, and arrange teams.
Then they're adding dualweilding, making jitterclicking even deadlier. With this you can still jitterclick by not even shaking anything, just repeatedly pressing right and left click.
Actually, if you watched the video, you would see that you will not, in fact, be able to attack with two weapons, you will only be able to attack with the one in your main hand.
So RIP MCSG. Let's see how the "Combat Update" works out. If it's good, then hey, that's great.
I dissagree with the "RIP MCSG" part. While it make take a bit of getting used to, so did the sprint key, and fishing rods. I'm personally super excited to see what the future will bring!