How do these changes fix the issues with Paladin?

[Ultimatecalibur]

10 tp off goring blade is not going to be noticed.

Oh, it will be.

Currently the GB->RA->RA/RoH rotation burns through 570 TP over 22.5 seconds with a GcD of 2.5. In that same amount of time you recover ~450 TP (420 with 7 ticks and 480 with 8 ticks). Which means using the rotation is a 120 TP drain every 22.5 seconds. The TP decrease on GB drops the TP drain to 110 meaning that Paladins will last about 9% longer before they run out of TP.

The shield bash change is nice for people doing A4S probably?

We don't know how good stuns will be for the 3.1 content, if stuns can be used to kill NMs and bosses faster/easier then its a significant cost reduction.