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First, the shudder happens more with low engine load. Not under WOT.
Think, cruising with very little throttle (but still some). That's when you'll experience shudder.
If your automatic transmission has fluid from before the 1st quarter of 2019, it's not a question of IF you'll get shudder. Just when. It's not a question of IF you should get new fluid put in, but how much do you want to procrastinate biting the bullet?
There are additives that will help mitigate the problem that the old fluid has with attracting water due to the low temp the trans fluid generally stays at and it's natural hydrophilic properties. These are not real fixes though and will only buy you some time.
A full fluid flush with new blue label fluid is the only way to fix the issue. If you wait until the shudder is very noticeable, you run the risk of causing perm damage to your torque converter due to the varnishing effects of the slipping and cavitation of water boiling in the fluid. You should do the new fluid before you feel the shudder if you are fairly sure you're currently using fluid from before Q1 2019.
if your car was made after q1 2019, then you already have the new fluid and should not experience shudder ever unless you have an unrelated issue.
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