Let me start off by saying I'm content with the state of nin and don't think they need changes. They are in a fine state since they scale the best as tiers progress. The increased crit/dh from better gear makes the rdps from ta scale very well.

I see the trick attack change as an overall nerf to non static nins as well as a potential job killing change. I clear savage 1-4 on 3 diff jobs in pf. Even though nin isn't the best dps the group always has higher dps. Ta on a 1 min window is a visual indicator for buff alignment that people focus on taking advantage of. Also the opener will change and nin doesn't have room for ogcd's. We can no longer use mug for bunshin and won't be able to use it in our burst window most likely. Mug will need a minimum of 400 potency to not make it a dps loss for the 40 gauge in old ults. I expect them to either buff nin to top tier on dps by increasing personal ta values or to completely kill the job forcing the low population of nins to swap jobs due to the uncertainty of their direction.

I do think these changes without more information is inconsiderate to the nin raiders. As we are left the dilemma of continuing to finish gearing up the job to bis for the ult or have to change jobs now not to gamble with the uncertainty of the changes. The nin design team already has proven itself to have bad ideas with the ew release state which caused a massive decline in the player base.