I don't know why isn't there an "official" thread, but there should be one.
In response to the feedback that there is still too much vertical progression in the Champion Point system, we have further reduced the maximum number of stages for passive stars (non-slotted) available. This will lower the vertical progression cap to 1560 rather than 2100 in the Warfare tree, and 1626 rather than 2352 in the Fitness tree. This will reduce the maximum power of the Champion Point system as well.
Based on what is written here and only that, zos is saying that they addressed an issue noone complained about (in order to fix something reasonable).
Issue: Too many CP are needed to minmax.
Not an issue: Total power of the CP system.
Basically people complained that in order to minmax you need over 2000 points, which indeed it is an issue. Lowering the amount of CP needed to reach "max" was indeed a correct move (although I grinded what I needed, I really wouldn't mind other people getting there with less "effort").
I could understand & see positevely changes that "raise the floor" instead of "lowering the ceiling" (except if "ceiling" is broken for some reason, like thrassian, but your reasoning doesn't suggest that). And with the "powercreep" in some cases some balance changes are needed. That's understandable, but afaik, that is not the case here at all.
But.. Zos could easily keep the system in the same power, by making each "stage 2" have the same total bonus as "old stage 3/4/5" (whatever was needed for max) - like what was done in preparation. Why isn't this the case?
People actually "lost" a little power (both dmg & mitigation) from the changes CP system next patch, and basically gained max health (and better sustain because we can use parsefood instead of bi-stat), but that was ok overall.
The communication/reasoning is also poor imho. If ceiling was too high an explaination covering that part was needed. Now basically zos is "blaming" the community for this change, which isn't true. Is like saying "don't complain more, they will nerf these more if you do".
And there are more issues for this changes, like penetration which heavily affects stam users (and I'm not an expert on that)