Damage shields were never a problem, except to those that cry about how strong sorcerers are in PvP. What most don't realize however is that without those shields, sorcs can be 2-3 shot by almost any player regardless of their gear or level. However, the bigger issue is in PvE, sorcerers are already at the lowest rung of the DPS spectrum, aside from the few seconds of ult they get at the beginning of some fights. You've now FORCED the sorc class to even lower dps, lower survivability and created and even lower "want" for them in groups, despite all these having been thought to be as low as they could go.
Shields cant be used efficiently (cost far too much now) nor can they be used effectively (only giving 6 seconds of a remote sense of "maybe i wont die from these 2 enemies that will one shot me once my shields are down"). Leave the damage shields alone, they are not a problem, nor a solution, you just treat them as such.
Complete garbage, poorly thought out changes again, cant say i'm surprised. Way to follow the curve, devs.