It would be a big improvement to have the block checked on client side and not on server. When you play on server with a little bit of ping (80+) or a host on WIFI, you can get hit when you see the shield icon on your screen and it change completely how you will play.
It is a know thing because few streamer that make guide say that they look at the ping first after joining a random queue. The ping can be green and you can still take some hits.
The worst is versus monk where they hit you 2-3 times though your block