As it stands, blocking is more of an anticipated move rather than a reaction. If you see that Devilite about to hurl a chair at you, you can warm up your block and be safe. If you notice it after it's left his hands, you're likely to be out of luck unless he's fairly far away from you.
My request is a separate line of shields or perhaps a trinket that offer(s) instant blocking so that you can block more reactively. Swordsmen could be more effective in monster duels by quickly parrying the monster's attack after a few strikes, allowing them to be more aggressive. Some balancing drawbacks could be increased player knockback, longer shield recharge time, or perhaps reduced shield strength.
The reason I'm making this request is because too many times I've seen something flying at me, tried to block instinctively, and still got hit anyway because blocking has a warmup.
Thank you for reading.
One major flaw... shield activation is a server side operation. Any latency has to be factored into your reaction time, and can become problematic if your far away from the servers.