Discover Secrets Hidden in the Sharval Wilds

Agree.
More specific and clear update information is needed.
We will have to wait and see what the percentage reduction is depending on range after the update.
For example, it could be:
0~2 yards 50% reduction
2~4 yards 40% reduction
4~6 yards 30% reduction
6~8 yards 20% reduction
8~10 yards 10% reduction

You’ve given such extreme example like the above before, right?
Of course this can happen, but it’s not all.

They are solidifying the Demon-Hunterish style a bit more.
“Shoot from afar while dodging”
If it does more damage up at close range as you say, then that is more of a problem.
Demon Hunter should not fight up close.
I think this will definitely increase the damage of Demon Hunter in PVE and it will be good in PVP as well.

Looking at it effectively…
Currently, painsower has 40% damage reduction.
That is, 60% of the original damage.
50% damage reduction is 50% of the original damage.
10,20,30% damage reduction is 90,80,70% of the original damage respectively.

50% damage reduction is effectively 50/60=83.3% of the original painsower damage. That is effectively 16.6% damage reduction.
40% damage reduction is effectively 100%.
30% damage reduction is 70/60=116.6%. That is effectively 16.6% damage increase.
20% is 80/60=133.3%. Effectively 33.3% damage increase
10% is 90/60=150%. 50% damage increase

Control skills become more important. Control skills are important for all classes in PVP, but especially for Demon Hunter.
I am confident in increasing the distance from the enemy because I use Painsower with Escape. The playstyle of all Painsower(strafe) players(also all DH players) is to attack while being away from the enemy.

Just tell that you misunderstood it as ‘50%~10% reduction from the DH’s current damage’

For your reference,
From the Chinese update note:

"For the legendary equipment “painsower”,
The fixed damage of 60% of the character’s primary attack and skill damage has been changed to increase as the distance from the enemy increases. When the distance is closest, it deals 50% damage, and when it is over 8m, it deals 90% damage.
For the legendary equipment “Fangspitter”, the maximum attack range has been increased from 7 to 10.

Developer’s Note: We want to maintain and strengthen the Demon Hunter’s position as a long-range damage dealer. Therefore, we have increased the damage ability at long range while reducing the damage in close combat."