I didnt get aggro.
I explained why Warcaster is better than Resilient: Constitution.
Any aggression in my posting is imagined by you.
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Judging by the rest of your posting you dont understand what Warcaster does.
If you roll a regular d20, every roll has a 5% chance.
If you have Warcaster, you have Advantage.
That means you roll TWO d20 and take the higher roll.
The chances are now:
20 - 9.75% (or 39 in 400)
19 - 9.25% (or 37 in 400)
18 - 8.75%
17 - 8.25%
16 - 7.75%
15 - 7.25%
14 - 6.75%
13 - 6.25%
12 - 5.75%
11 - 5.25%
10 - 4.75%
9 - 4.25%
8 - 3.75%
7 - 3.25%
6 - 2.75%
5 - 2.25%
4 - 1.75%
3 - 1.25%
2 - 0.75% (or 3 in 400)
1 - 0.25% (or 1 in 400)
As you can see, high rolls are now much more likely to happen than low rolls.
For example the chance to roll 15 or higher is now 9.75%+9.25%+8.75%+8.25%+7.75%+7.25% = 6*8.5% = 51%
you forget about one thing, you can get war caster only from feat but you can get con res from items that why war caster is better