I think most of the people who are arguing negatively against this cost-reduction update are failing to see the huge picture.
Currently, upgrading Energy and Soul require [Sacred Vials], and keep in mind that this is a upgrade material that isn't accessible in-game via normal farming means (doing dungeons, dailies, weeklies, etc.) Yes, you can buy these on the market, but that's not "farming" them; that's buying them, and they usually go for ~200g/ vial, which is expensive.
The best, and probably only times when people are able to farm or purchase vials through microtransactions are through events, and those don't happen as often. They can also be bought through the Hongmoon Store, but they rarely show up, and unfortunately, they require real cash. Considering that most events are usually made in favor towards people who've played this game entirely through already (not referring only to end-game, high-geared players), new players are usually left out, and when they reach what's considered the "end-game farm" for Blade & Soul, the event might already be over.
This update was designed in favor of the new players who could struggle upgrading their Energy and Soul and farming for the required materials right out of the Level 60 gate, and right out of finishing the story all the way through. When the update goes live, a lot of new players will likely have an easier time upgrading their Soul and Energy, both of which are important due to providing not only AP, but Boss AP buffs and overall damage. The developers replaced these vials with materials we can farm by normal means, and that's a huge victory when it comes to upgrading because people would always leave Soul and Energy last to upgrade due to how expensive upgrading both were. But now, we can upgrade them up to Orange with non-expensive materials, which is beneficial nonetheless.