It doesn't help either that having arm lock off still doesn't let you shield with it, as the shield arm (on the Cents, at least) doesn't move at all.
At the very least, the shield arms should be positioned straight forward, if not angled slightly inward to more easily protect the torso.
Ideally, I'd like to see a Braced Stance™ for mechs that don't have weapon doors that would have a similar delay to firing, but rather than the weapon doors, they would assume a stance where they use their arms to shield the torso more effectively, and uncover only to fire weapons. That's a bit of a pipe dream though. I'd be happy if they just adjusted mechs with hardpoint-less arms to better shield.
TL;DR: Please adjust the shield arms of mechs like the Centurion so that they actively protect the torso, rather than angle away from the body so you have to almost expose your back to actually effectively use the shield arm.
EDIT: Here's an example of how the left arm doesn't move:
Edited by Sable Dove, 24 October 2018 - 09:01 PM.